TY  - BOOK
AU  - Rolfe,Deette,1879-
TI  - The Rock River country of northern Illinois,
AV  - QE105 .A3 no.2
PY  - 1929///
CY  - Urbana, Ill., [Springfield
PB  - Jeffersons Printing & Stationery Co.]
KW  - Geology
KW  - Illinois
KW  - Rock River Valley
N1  - At head of title: State of Illinois.  Department of Registration and Education; Bibliography: p. [59]
ER  -