Economic impact of removing numerical limits on sound emissions to class C land, R76-19 /

"Project no. 30.014."

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

Project no.10.059.

Economic impact of proposed airport noise regulations, R77-4. Volume II : economic analysis of public airports outside Chicago /

Project no. : 30.017.

Economic impact of changing the carbon monoxide emission limitations for steel mills, R78-1 /

Includes bibliographical references.

Economic impact of proposed regulation R77-12 (Rule 950) on wastewater sludge disposal in the State of Illinois /

Includes bibliographical references.

Economic impact of requiring maintenance/malfunction plans for air pollution control equipment, R79-3 /

Project no. 10.080.

Economic impact of proposed amendments to snowmobile noise regulations, R79-10 /

Bibliography: p. 12.

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

Includes bibliographical references.

Economic impact study of R81-11 trihalomethane standards for public water supplies /

"Project no. 80-254."

Economic impact study of proposed airport noise regulations, R77-4 /

"January 1981."

Economic impact study of landfill regulations (R88-7) : final report /

"Printed: January 1990."

Economic impact study for proposed groundwater quality standards 35 IL Admin. Code 260 : final report /

"Contract: EA 98."

Economic impact study of proposed cross connection regulations, R87-37 : final report /

"Project: 89/283."

Economic impact studies : the first year in review.

"Project no. 60.028."

Economic impact study of proposed airport noise regulations, R 77-4. Volume I : technical study of public airports outside Chicago /

"Project no. 30.017."