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Illinois State Geological Survey (46) U. S. Department of the Interior (30) Anonymous (25) Archibald Geikie (15) Charles Darwin (14) Robert Hunt (7) Thomas Sterry Hunt (7) Charles Lyell (6) James Croll (6) Henry Martyn Bannister (6) John William Dawson (5) David Dale Owen (5) Geological and Geographical Survey of Th (5) Roger Marjoribanks (4) Alexander Winchell (4) Pennsylvania Dept of Forests and Wa; Geological Survey (U S ) (4) Amos Eaton (4) Jules Marcou (4) David Page (4) Evan Marlett Boddy (4) Louis Agassiz (4) Thomas Henry Huxley (4) Angelo Heilprin (4) Alfred Hannam 1895- Bell; Illinois State Geological Survey (3) Joseph Prestwich (3) Byrem Lawrence (3) Lucien Marcus Underwood (3) John D Beaulieu (3) William Devonshire Saull (3) Roderick Impey Murchison (3) Alfred R. C. Selwyn (3) Charles Clay (3) George William Featherstonhaugh (3) Richard Owen (3) James Dwight Dana (3) Roswell Geological Society (3) Franklin Platt (3) United States Geological Exploration of (3) John Pye Smith (3) United States Geological Survey (3) U S Geological Survey (3) William Whitaker (3) Martin J. S. Rudwick (2) Roy E. Hunt (2) G.A.F. Molengraaff (2) Dominique Frizon de Lamotte; Pascale Leturmy; Pauline Souloumiac; Adrien Frizon de Lamotte (2) Frank Howie (2) Fred G. Bell (2) Dinesh C. Mishra (2) T. Bolton (2) Owen M. Phillips (2) T. B. Brooks (2) John E. Taylor (2) Marsden Manson (2) Geological Survey of Great Britain (2) Horace H. Hayden (2) David T. Ansted (2) Eugene Woldemar Hilgard (2) Charles P Williams (2) Marcelle K Boudagher-Fadel (2) West Virginia Geological and Economic; John Littlefield B. 1863 Tilton; William F. (William Frederick) Prouty (2) California Division of Mines and Geo; American Association of Petroleum Geo; Society of Economic Paleontologists and (2) Geological Survey (U S ) Ground Wate; California Dept of Water Resources (2) Olaf Pitt 1889- Jenkins; California Division of Mines and Geo (2) W. P. (William Porter) 1919- Irwin (2) H. B. (Harold Bowen) 1901- Willman; James Norman Payne; Walter Henry 1892- Voskuil (2) W G (William Garland) Barrett (2) Richard Owen; Leo Lesquereux; Robert Peter (2) El Rockwood (2) James H Wellings (2) R A 1857- Marriott (2) Nathaniel M Perlmutter; Wallace De Laguna; Russell Suter (2) J W Dawson (2) Thomas Hodgkin (2) Roderick I Murchison (2) Frederick Gardner Clapp (2) Geological Survey of Pennsylvania; Pennsylvania Board of Commissioners (2) George Hall Ashley (2) Mary H Carlson (2) Scott Southworth (2) Katherine Y McMullen (2) Samuel Bowdlear 1859-1910 Green (2) Edward Hull (2) George M Bennison; Paul A Olver; Keith A Moseley (2) Leszek J. Kaszubowski (2) Geological Society London (2) Barnabas Coffin Hobbs (2) James William Davis (2) Mineralogical And Geological Section (2) Robert Douglas (2) Horace Bolinbroke Woodward (2) John Rutter (2) Nathan Howe Parker (2) William Rhind (2) James Spottiswoode Wilson (2) Henry F R S Hicks (2) Albert William Giles (2) Walter Herman Bucher (2) Mary Jane Rathbun (2) Arthur Francis Buddington (2) Frank Harold Hanna Roberts Jr (2) Douglas Ramsay Semmes (2) Leslie Erskine Spock Jr (2) Edgar Paul Rothrock (2) Walter Vernon Searight (2) Leonard R. Ingersoll (2) E. W. Preston; E. L. Gardner (2) Gerald Molloy (2) National Park Service (2) Washington Geological Survey (2) U. S. Geological Survey; U. S. Department of the Interior (2) The U. S. Department of the Interior (2) Furaha Ngeregere Lugoe (2) Prakash R. Golani (2) Osman Abdullatif; Mohammad Makkawi; Mohamed Yassin (2) Suresh Bhalai (2) Andrew Y. Glikson (2) Mark Baskaran (2) Roozbeh Khosrokhavar (2) E Cox (2) S Buckley (2) Henry J Carter (2) J D Whitney (2) William Whitaker; William Herbert Dalton (2) George F. Becker (2) Alfred Russel Wallace (2) Chongbin Zhao; Bruce E. Hobbs; Alison Ord (2) Heorhii Rudko (2) Martin Smith (2) Josiah Gilbert (2) Lord Acton (2) Jianfang Zhang; Chaohui Zhu; Longwu Wang; Xiaoliang Cai; Ruijun Gong; Xiaoyou Chen; Jianguo Wang; Mingguang Gu; Zongyao Zhou; Yuandong Liu (2) Chuanlong Mou; Xiuping Wang; Qiyu Wang; Xiangying Ge; Bowen Zan; Kenken Zhou; Xiaowei Chen; Wei Liang (2) Chun Liu (2) W. Mykura; Geological Sciences Inst. (1) Sanjeev Rajput; Naresh Kumar Thakur (1) Andrew Mitchell (1) Richard J. Lisle (1) Norman Herz; Ervan G. Garrison (1) Andrew S. Goudie; Denys Brunsden (1) Matthew J. Genge (1) National Academies of Sciences Engineeri; Division on Earth and Life Studies; Board on Earth Sciences and Resources (1) B.A. Bolt; W.L. Horn; G.A. MacDonald; R.F. Scott (1) R.G. Park (1) Luis Gonzalez de Vallejo; Mercedes Ferrer (1) Yongchen Song; Cong Chen; Wenfeng Hu (1) David A. Wood (1) F.P. Agterberg; Eric Grunsky (1) Marini Luigi (1) Ray Boswell; Deborah Hutchinson; Carolyn Ruppel; Joseph Wilder; Tim Collett (1) Jan Martin Nordbotten; Michael A. Celia (1) Dawson George M (1) Samuel Deane (1) William J. Sollas (1) Edward Allison Hill (1) John Milton Nickles (1) Rob A. Strachan (1) Ernest Spon (1) Alexander William Evans (1) Various (1) Frank De Yeaux Carpenter (1) J P Lesley (1) Arthur Winslow (1) Thomas Antisell (1) Robert Peter (1) E. W. Preston (1) James X. Corgan (1) Kenneth Pye (1) K. Magara (1) Stephen M. Testa (1) Indiana Geological and Water Survey (1) Quenten D. Singewald (1) Richard C. Robinson (1) Walter Henry 1892- Voskuil; G. N. Oliver; Illinois State Geological Survey (1) Alfred Hannam 1895- Bell; George Vincent 1907- Cohee; Illinois State Geological Survey (1) Willis L. Busch; Illinois State Geological Survey Min (1) Wayne Franklin Meents (1) Meredith Eggers Ostrom; Illinois State Geological Survey (1) Robert Mann 1912- Grogan; J. E. (John Everts) 1897-1979 Lamar; Illinois State Geological Survey (1) Geological Survey (U S ); California Dept of Water Resources (1) Gilbert H. (Gilbert Haven) B. Cady (1) Institute of Transportation and Traffic; Geological Survey (U S ) (1) Robert M. (Robert Max) Kosanke; Illinois State Geological Survey (1) Harold R. (Harold Rollin) 1. Wanless (1) F. W. Giessner; Geological Survey (U S ) (1) Geological Survey (U S ) (1) Leland 1910-1955 Horberg; Paul Edwin Joint Author Potter; Illinois State Geological Survey (1) Harold R. (Harold Rollin) 1. Wanless; Illinois State Geological Survey (1) John Webster Foster; Merlyn Boyd Joint Author Buhle (1) Louis Aubrey 1890- Mylius; Illinois State Geological Survey (1) James C. Bradbury; Illinois State Geological Survey (1) George E. (George Elbert) 18 Ekblaw; Ralph E. (Ralph Early) 1902- Grim (1) Edson S. (Edson Sunderland) Bastin (1) Philip A. Lydon (1) James C. Bradbury; James W. Baxter; Illinois State Geological Survey (1) Cordell 1908- Durrell (1) Kenneth Hunkins; Lamont Geological Observatory (1) J. E. Lamar; H. B. (Harold Bowen) 1901- Willman; Illinois State Geological Survey (1) J. Marvin (James Marvin) 1899- Weller (1) Paul O (Paul Orman) McGrew; Michael Casilliano (1) Geological Survey; William Henry Jackson (1) Wyoming Historical and Geological Soc (1) Economic And Mississippi Geological (1) Horace Edwin Hayden; Wyoming Historical and Geological Soc (1) James Michael 1850- Hodge; Kentucky Geological Survey (1) John Patterson Maclean (1) Josiah Dwight Whitney (1) George Otis Smith (1) J. W. Salter; Adam Sedgwick; John Morris (1) Croll James (1) Waldemar Lindgren (1) David Honeyman (1) Geological Society Of London (1) A Layman (1) Charles John Alford (1) Thomas Henry Holland; Jean Baptiste De La Tour; Henry Hubert Hayden (1) Maria M. Ogilvie Gordon (1) James Henry Lees (1) Geological Survey Of Great Britain (1) U. S. Geological And Geographical Survey (1) Francis Hobson Appach; Caius Julius Caesar (1) George Clinton Swallow (1) William Wallace (1) David Dale Owen; Edward Travers Cox; William Elderhorst (1) A H Worthen; Henry Martyn Bannister; Edward Travers Cox (1) Joseph Beete Jukes (1) Edward Maule Cole (1) Edward Travers Cox (1) George Jennings Hinde (1) Henry John Carter (1) Eli Bowen (1) John Hopwood Blake (1) George Douglas Campbell (1) Conway Lloyd Morgan; Edward Theodore Compton (1) William Cockburn; Roderick Murchison (1) Henry Denny (1) John Patterson MacLean (1) Thomas Mellard Reade (1) Hugh Miller (1) J D Sainter (1) William Scott (1) Sidney Smith Lyon; David Dale Owen (1) Ferdinand VanDeVeer Hayden (1) Edward Travers Cox; Henry Engelmann (1) George Mercer Dawson (1) Henry Youle Hind (1) Josiah Gilbert; George Cheetham Churchill (1) Georges Cuvier; Robert Jameson; Robert Kerr (1) Charles Silvertop (1) Georges Cuvier; Robert Kerr (1) Issachar Cozzens (1) Robert Hunt; Frederick William Rudler (1) Georges Baron Cuvier; Robert F R S E Jameson (1) Gideon Algernon Mantell (1) David Milne (1) Alfred Richard Cecil Selwyn (1) Gerald De Purcell Cotter; Thomas Henry La Touche (1) Thomas Oldham; Richard Dixon Oldham (1) Georges Baron Cuvier; Robert Jameson (1) Hilary Bauerman (1) William Henry Fitton (1) John Sutherland (1) James MacFarlane (1) Frederick Sir K C M G Maccoy (1) George Highfield Morton (1) Archibald Geikie; Roderick Impey Murchison (1) Maria Graham; George Bellas Greenough; Maria Callcott (1) John Phillips (1) Richard Griffith (1) Sidney Lyon (1) George Greenwood; Granville Greenwood (1) R E B (1) Adam Sedgwick (1) Thomas F G S Andrew (1) Charles Tilstone Beke (1) Joseph Bewick (1) Thomas Oldham (1) Louis Agassiz; Elizabeth Cabot A (1) Louis Agassiz; Elizabeth Cabot Cary Agassiz (1) John Edmund Thomas (1) Wintour F Gwinnell (1) Ebenezer Baldwin Andrews (1) David Hiram Williams; Thomas Oldham (1) James Patrick Howley (1) Theodore Compton; Edward Compton (1) James A M MacFarlane (1) Ebenezer Emmons (1) Henry Walker (1) William Adam (1) Henry Hicks; Thomas Davies (1) John Franklin (1) Matthias Dunn (1) Henry Leighton (1) Olaf P. Jenkins (1) Charles Newton Gould; Frank E. Lewis (1) A. E. Weissenborn; Henryk Bronislaw Stenzel; John T. Lonsdale (1) Erwin Charles Stumm (1) Wilhelm Bock (1) William Henry Twenhofel (1) Albert Lincoln Washburn (1) Jesse James Galloway; Harold V. Kaska (1) George Guion Williams; George A. Bartholomew; Raymond B. Cowles (1) Armand John Eardley (1) George H. Ashley (1) George Dillon Morgan (1) George Nicholas Pipiringos (1) Fred F. Lawrence (1) Geological Soc of the Oregon Country (1) George H. Dixon; D. H. Baltz; T. F. Stipp (1) Victor Thomas Allen (1) Charles F. Deiss (1) Roy Lee Moodie (1) Charles E. Wier (1) Thomas Augustus Jaggar (1) Robert Walpole Ellis (1) Aldred S. Warthin Jr (1) Charles Deiss (1) Duncan Junior McGregor (1) George Evert Condra (1) Roy a. Wilson (1) Freeman Ward (1) Louisiana Geological Survey (1) Helmuth Wedow Jr; W. S. West; A. E. Nelson (1) George W. Moore; James G. Stephens (1) Wilhelm Eitel (1) William Low Russell; Edgar P. Rothrock (1) Ray Earland Morgan; Bruno C. Petsch (1) Alfred Livingston Jr (1) Charles J. Ryan (1) Henry N Ohlin (1) Norman S MacLeod; D R Sherrod; Lawrence A Chitwood (1) U.S. Geological Survey; U.S. Department of the Interior (1) John William Salter; Adam Sedgwick (1) U.S. Department of the Interior; U.S. Geological Survey (1) Stephen R Moran; John a Cherry; Gerald H Groenewold (1) Rev. Beanland (1) V M Kreiter (1) Geological Survey of California (1) Economic And to Mississippi Geological (1) James Merrill Safford (1) State Geologis Missouri State Geologist (1) Raphael Pumpelly (1) Survey Geological Survey of California (1) John Peter Lesley (1) Geological S Arkansas Geological Survey (1) Geological Surve Iowa Geological Survey (1) Francis S. Holmes (1) Arnold Hague (1) Maria Hack (1) John Bolton (1) W. H. Sherzer; Alfred C. Lane; C. H. Gordon (1) Henry Thomas De La Beche (1) George M. Bennison (1) Alex Maltman (1) Giovanni Rantucci (1) T. V. Loudon (1) J. Christian Franson; U. S. Geological Survey; Milton Friend (1) Philip Lesslar (1) U S Geological Survey; U S Fish & Wildlife Service (1) Gregory M. Molinda (1) U. S. Department of Interior (1) Charles G. Crawford; Timothy a. Cohn; U. S. Departmen U. S. Geological Survey (1) William R. Pfeiffer; U. S. Department of the Interior; U. S. Geological Survey (1) U. S. Department of the Interior; U S Geological Survey; Louis C. Murray Jr (1) U. S. Department of the Interior; U S Geological Survey; Ana Maria Garcia (1) Thomas Huxley (1) Roland Pusch; Raymond N. Yong; Masashi Nakano (1) Edward Revollo (1) United States Departm Geological Survey (1) Mary C. Hill; Steffen W. Mehl (1) Stewart A. Rounds; U. S. Geological Survey; Annett B. Sullivan (1) Joseph P. Rausseau; Roy C. Bartholomay; Jason C. Fisher (1) Congressional Research Service (1) Us Department of Geological Survey (1) Thomas H. Huxley (1) John S. Newberry (1) J. Paul Guyer (1) H J Johnston-Lavis (1) Palouse Prairie Chart Fourth Grade Crew (1) Ricardo a. Valls P. Geo (1) Barbara Ransom; Sonya Wainwright (1) William J. Blake (1) Robert Fillmore (1) Robert Langston; Carl Chapman (1) The Law Library (1) Andrew C. Scott; David Freedberg (1) Marcelle K. BouDagher-Fadel (1) Ann C. Pizzorusso (1) Chemeketa Geology Faculty (1) United States House of Representatives; Committee on Natural Resources; United States Congress (1) J Paul Guyer (1) Manuel Enrique Pardo Echarte; Osvaldo Rodríguez Morán; Lourdes Jiménez de la Fuente; Jessica Morales González; Orelvis Delgado López (1) Abdullatif Osman Abdullatif; Makkawi Mohammad Makkawi; Yassin Mohamed Yassin (1) Reza Yousefzadeh; Alireza Kazemi; Mohammad Ahmadi; Jebraeel Gholinezhad (1) Yousefzadeh Reza Yousefzadeh; Kazemi Alireza Kazemi; Ahmadi Mohammad Ahmadi (1) Martin Bohle; Boris Holzer; Leslie Sklair; Fabienne Will (1) Jinsheng Wang; Hanin Samara; Philip Jaeger (1) Fadhil N. Sadooni; Hamad Al-Saad Al-Kuwari (1) Alain Izart (1) Ahmed Gelany; Atef Ibrahim; Badawi Ismaiel (1) J William Dawson (1) Richard Owen; And Others (1) International Geological Congress (1) Alexander McHenry; William Whitehead Watts (1) Julian Edmund Tenison-Woods; New Zealand Geological Survey Dept. (1) Philip Creveling Warman (1) Of Canada Geological Survey; Lawrence M (Lawrence Morris) Lambe; Lawrence M Lambe (1) A. Winchell (1) Charles Henry Hitchcock (1) Charles Fox-Strangways; Robert Etheridge (1) Ferdinand Vandeveer Hayden (1) Henry Rowe Schoolcraft; George William Featherstonhaugh (1) Thomas Sopwith (1) John Morton (1) Robert Bakewell (1) S. Buckley (1) Charles Eugene De Rance; Robert Etheridge (1) Samuel Botsford Buckley (1) Zheming Zhang; Ramesh K Agarwal (1) Munawar Shah (1) Oraki Kohshour Iman (1) Jemal Ahmed; Kassa Amare (1) Kumar Ankit (1) Eugène DuBois (1) Ashenafi Meresa (1) Vartika Singh (1) Uche-Peters Adiela (1) Nina Lydie Ambassa Moko; Olivier Njoh A; Kennedy Fozao (1) Bolko Schweisfurth (1) Ahmed Mohammed Eldosouky (1) Valery Zuev (1) Bernard Musafiri Pauni (1) Gregory Sikakwe (1) Yao Lamine G Richard Dzotsi (1) Marco Pérez; Alberti Viloria (1) Franck Kalala Kaniki; Paul Lunda Lubamba (1) Ravikumar Kurup; Parameswara Achutha Kurup (1) Nalle Windahl (1) Henry White; Thomas W Newton (1) Oklahoma Geological Survey (1) Edward Hull; John William Salter (1) W A E Ussher (1) Charles William Andrew (1) Charles D Walcott (1) Thomas H Huxley (1) Michael Casilliano; Paul O McGrew (1) Donald E Trimble (1) Edw Le Rice (1) Rebecca Harding Davis Et Al (1) Max Brand (1) Shouli Qu (1) Mou Chuanlong Mou; Wang Xiuping Wang; Wang Qiyu Wang (1) Jinchuan Zhang; Jianghui Ding; Haikuan Nie; Wei Dang; Xuan Tang; Ali Saud Madni (1) Huanqing Chen (1)