Mineral resource research and activities of the State Geological Survey, 1949-1950
Contributors: Illinois. Board of Natural Resources and Conservation
Series: Illinois State Geological Survey. Circular -- no. 172; Circular (Illinois State Geological Survey) -- no. 172.; Circular (Illinois State Geological Survey) -- 172.
Published: 1951
Place of publication: Urbana
Language: eng
Number of pages: 30
Subjects: Mines and mineral resources; Geological surveys
Notes: "Reprinted from the annual report to the Director, Dept. of Registration and Education, for fiscal year 1949-1950."

Board of Natural Resources and Conservation, p. 29-30.

Bibliography: p. 25-27.