TY  - BOOK
AU  - Sauer,Carl Ortwin
TI  - Geography of the upper Illinois Valley and history of development,
T2  - Illinois. State geological survey. Bulletin
AV  - QE105 .A16
PY  - 1916///
CY  - Urbana
PB  - Illinois state geological survey, University of Illinois
KW  - Geology
KW  - Illinois
ER  -