Fundamental factors in treatment of iron bearing waters /

"Progress report for the period February 1, 1959 to December 15, 1960 for the National Institutes of Health U. S. Public Health Service Research Project RG-6436."

Effect of phosphates on water treatment : phosphates in Illinois surface waters /

"Final report for the period June 15, 1955 to September 15, 1957 for American Association of Soap and Glycerine Producers."

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.

Biological treatment of petrochemical wastes /

Supported by Division of Water Supply and Pollution Control U.S. Public Health Service Research Project WP-138.

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

"May 6, 1950."

The effect of induced flocculation on the settling and thickening behavior of activated sludge /

"Supported by U.S. Public Health Service Traineeship EH66-616 and U.S. Dept. of Interior Research Project WP 01011-01."

Factors influencing free-living nematodes in water supplies /

"Supported by Division of Water Supply and Pollution Control U. S. Public Health Service Research Project WP-00047"

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

"IMSRP-IV."

Fate of synthetic detergents in soil and ground water /

"November, 1965."

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.

Removal of free-living nematodes by rapid sand filters /

Vita.

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

"Leader: George M. Wilson.