Waterloo area
Subtitle: Monroe County : Waterloo Quadrangle
By: by Gilbert O. Raasch
Contributors: Illinois State Geological Survey
Series: Guide leaflet -- 50-F; Guide leaflet (Illinois State Geological Survey) -- 50-F.
Publisher: State of Illinois, Dept. of Registration and Education, State Geological Survey Division
Published: 1950
Place of publication: Urbana, Ill
Language: eng
Subjects: Geology
Other titles: Monroe County, Waterloo Quadrangle; Waterloo Quadrangle
Notes: Cover title.

"November 4, 1950."