Information circular /
Illinois State Geological Survey.

Description

Viewability

Item Link Original Source
Full view   no.1-4,8,10-18,20-22 (1931-37) University of Minnesota
Full view   NO4 1933 The Ohio State University
Full view   NO8 1934 The Ohio State University
Full view   NO10-11 1935 The Ohio State University
Full view   no.12 1935 The Ohio State University
Full view   NO13 1936 The Ohio State University
Full view   no.14 1936 The Ohio State University
Full view   no.17 1936 The Ohio State University
Full view   NO20-22 1937 The Ohio State University