Economic impact of change in pH regulation, R76-21 /

"Project no. 80.112."

Economic impact of a proposed change in the ammonia effluent standards, R77-6 /

"Project no. 80.094."

Economic impact of relaxing the regulation on sulfur content of fuel oils (R 75-8) /

Project no.10.059.

Economic impact of dissolved solids regulation upon the coal mining industry (R76-7) /

Includes bibliographical references.

Economic impact studies : the first year in review.

"Project no. 60.028."

Effects of noise and hearing acuity upon visual depth perception and safety among humans /

Bibliography: p. 29-31.

Economic impact study of the proposed motor vehicle (in-use) noise regulations : report of the Task Force on noise.

Bibliography: p. 152-155.

Economical flue gas desulfurization resulting in valuable fertilizer : supplemental condensation of report /

Supplemental condensation of the author's Valuable fertilizer products from high sulfur coal stack gas.

Embarras River area assessment /

"Critical Trends Assessment Program."--Cover.

Fox River area assessment /

"Critical Trends Assessment Progarm."--Cover.

Headwaters area assessment /

"Critical Trends Assessment Program."--Cover.

Illinois data catalog (preliminary print)

"Prepared for the Illinois Institute for Environmental Quality."

Illinois River Bluffs area assessment /

Critical Trends Assessment Program (CTAP)

Illinois River Bluffs area assessment /

"Critical Trends Assessment Program."--Cover.

Illinois surface-mined land regulation and reclamation : interim report /

Caption title.