Geography of the upper Illinois Valley and history of development,
Sauer, Carl Ortwin, 1889-
Geography of the upper Illinois Valley and history of development, by Carl Ortwin Sauer. Printed by authority of the state of Illinois. - Urbana, Illinois state geological survey, University of Illinois, 1916. - 208 p. fold. front., illus., fold. map, diagrs. 26 cm. - Illinois. State geological survey. Bulletin no. 27 . - Bulletin (Illinois State Geological Survey) ; no. 27. .
gs 17000080 //r88
Geology--Illinois.
QE105 / .A16
Geography of the upper Illinois Valley and history of development, by Carl Ortwin Sauer. Printed by authority of the state of Illinois. - Urbana, Illinois state geological survey, University of Illinois, 1916. - 208 p. fold. front., illus., fold. map, diagrs. 26 cm. - Illinois. State geological survey. Bulletin no. 27 . - Bulletin (Illinois State Geological Survey) ; no. 27. .
gs 17000080 //r88
Geology--Illinois.
QE105 / .A16