Report of a survey of the Michigan state library for the Michigan state board for libraries, May, 1938.

Mode of access: Internet.

High-calcium limestone near Morris, Illinois

At head of title: State of Illinois. Department of registration and education. Division of the State geological survey.

Earth history field trip for high school science teachers : Jacksonville, Illinois, October 22, 1949 /

Gilbert O. Raasch, Conference director; Principal John Agger, Conference host.

Oil investigations in Illinois in 1916, under direction of Fred H. Kay.

"Work in cooperation with U.S. Geological Survey."

Oil and gas development and possibilities in east-central Illinois. (Clark, Coles, Douglas, Edgar and parts of adjoining counties)

At head of title: State of Illinois. Department of registration and education. Division of the state geological survey.

Rock Island-Moline area : Rock Island County, guide leaflet for Illinois Academy of Science /

"May 6, 1950."

High-extraction coal mining in Illinois : effects on crop production, 1985-1987 /

"IMSRP-IV."

Illinois fluorspar /

Includes bibliographical references (p. 34-36).

Earth history field trip for high school science teachers : Vienna, Illinois, November 5, 1949 /

Gilbert O. Raasch, Conference director; Principal B.W. Hunsaker, Conference host.

Lead and zinc deposits of Northwestern Illinois,

Mode of access: Internet.

Conservation school guide leaflet: Fairgrounds, Springfield, Illinois : Springfield area, Sangamon Co. : Springfield Quadrangle.

"Leader: George M. Wilson.

Oil and gas development in Illinois during 1950 /

"Reprinted from Statistics of oil and gas development and production covering 1950, A.I.M.E."

Pennsylvanian spores of Illinois and their use in correlation / by Robert M. Kosanke.

"Manuscript completed in August 1948."

Illinois natural resources : an industrial developmental asset /

Cover title.

Pennsylvanian ostracodes of Illinois.

"References": p. 124-126.