Oil and gas drilling in Illinois; monthly report.

At head of title, -Dec. 1978: State of Illinois, Dept. of Registration and Education; Jan. 1979-: State of Illinois, Illinois Institute of Natural Resources.

Operating statistics of telephone companies in Illinois /

Description based on: year ended Dec. 31, 1979; title from cover.

Older women in Illinois : the differences they face.

Cover title.

Official program and entry list of the Illinois State Fair.

Mode of access: Internet.

Outdoor Illinois.

Title from cover.

Outlook for the Illinois coal industry : report of the Illinois Coal Development Board.

"March 1992."

Optimization of traffic signal controls within equilibrium route choice models : final report to Illinois Department of Transpotation/

Cover title.

Osteoporosis in Illinois : analysis of hospital discharge records from 1992 to 1995 /

"December 1997. "

Outdoor recreation in Illinois /

Cover title: Outdoor recreation in Illinois : the statewide comprehensive outdoor recreation plan.

Outdoor recreation in Illinois, the ... policy plan.

"Public review draft."

Outdoor recreation in Illinois, action plan /

Mode of access: Internet.

Osteoporosis in Illinois, 2003.

"3/03"--Colophon.

Outlook for the Illinois coal industry : report of the Illinois Coal Development Board.

Vol. for 1991 has outlook for 1995-2000.

Outlook for the Illinois coal industry, 1995-2000 /

"November 1991."

Performance of resurfacing of JRCP and CRCP on the Illinois interstate highway system /

"Project IHR-517, Illinois Cooperative Highway Research Program."