The Illinois Gap Analysis final report, 2006.

U.S. Geological Survey, Department of Interior Cooperative Agreement No. 14-48-0003-95-1090

The Illinois Headwaters : an inventory of the region's resources.

"A product of the Critical Trends Assessment Program (CTAP) and the Ecosystems Program of the Illinois Department of Natural Resources (IDNR)"--P. [2] of cover.

The Illinois River bluffs : an inventory of the region's resources /

Statement of responsibility from P. [3] of cover.

The Kishwaukee River Basin : an inventory of the region's resources /

"A product of the Critical Trends Assessment Program (CTAP) and the Ecosystems Program of the Illinois Dept. of Natural Resources (DNR)"--P. [2] of cover.

The Mackinaw River Basin : an inventory of the region's resources / [Susan L. Post].

"A product of the Critical Trends Assessment Program (CTAP) and the Ecosystems Program of the Illinois Dept. of Natural Resources (DNR)"--P. [2] of cover.

The Spoon River basin : an inventory of the region's resources 1998 /

"A product of the Critical Trends Assessment Program (CTAP) and the Ecosystems Program of the Illinois Department of Natural Resources (IDNR)--P. [2] of cover.

The upper Des Plaines River basin : an inventory of the region's resources /

"A project of the Critical Trends Assessment Program (CTAP and the Ecosystems Program of the Illinois Department of Natural Resources (IDNR)"--P. [2] of cover.

Thorn Creek area assessment /

Examines a small area of southern Cook County and northeastern Will County in Illinois--a portion of which has been designated a state Resource Rich Area.

Upper Rock River area assessment /

Examines an area in north central Illinois--a portion of which has been designated a state Resource Rich Area.

Upper Des Plaines River area assessment /

"Critical Trends Assessment Program."--Cover.

Vermilion River (Illinois River Basin) area assessment.

The Critical Trends Assessment Program (CTAP) documents changes in ecological conditions.

Upper Sangamon River area assessment.

"Examines an area of more than 1,200 square miles in east central Illinois ... designated a state Resource Rich Area."--P. iii.

Vermilion River area assessment.

Examines an area in east central Illinois along the Indiana/Illinois border designated a state Resource Rich Area.