A water quality investigation of the Crooked Creek Basin (Kaskaskia River Basin Segment A-02), July - August 1978 /

Bibliography: p. 61-62.

Air, land & water : activity book : fifth and sixth grades /

"Materials may be duplicated for classroom/activity use."

Air, land & water : teachers' manual : fifth and sixth grades /

"Materials may be duplicated for classroom/activity use."

Aftermarket catalytic convertors : guide to their purchase, installation, and use /

"January 1989."

An intensive survey of the Elkhorn Creek Basin, 1985.

"IEPA/WPC/88-017."--Cover.

An intensive survey of the Pecatonica River Basin, 1984-1985.

"February 1988."--Cover.

An assessment of the water quality of the Rock River Basin derived from a biological investigation /

"Prepared for the Illinois Environmental Protection Agency."

An intensive survey of Rock River tributaries, 1985.

"February 1988."--Cover.

An assessment of the water quality of the Cache River Basin derived from a biological investigation /

"Prepared for the Illinois Environmental Protection Agency."

An intensive survey of the Skokie River (Segment A-01 of the Des Plaines River Basin), April-December, 1978 /

Bibliography: p. 66-67.

Annual environmental conditions report ... /

Title from cover.

Annual toxic chemical report : a summary of information contained in the toxic chemical report forms for calender [sic] year ...

Mode of access: Internet.

Beavers and muskrats.

"Mar-2001"--Colophon.

Blue Creek watershed project : executive summary and recommendations /

IEPA/WPC/84-008.

Bureau of Land.

June 1993.