Economic impact of existing ammonia nitrogen water quality standard, IPCB chapter 3 rule 203(f) /

"July, 1981."

Economic impact study of proposed IPCB amendments to water pollution regulations, R80-6 /

Project no.: 80.235.

Economic impact of revisions of the public water supply regulations, R77-13 /

Project number 80.118.

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

"Project no. 80.112."

Economic impact study of proposed airport noise regulations, R77-4 . Volume III, technical study of public airports in Chicago /

Project no. 30.017.

Economic impact study of proposed airport noise regulations, R77-4. Volume 4, economic analysis of O'Hare and Midway Airports /

Project no.: 30.017.

Economic impact study of proposed site specific changes to water pollution regulations affecting the city of Tuscola, Douglas County, Illinois : final report /

Contract: EA 44.

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

"Project no. 80.094."

Economic impact of proposed water quality and effluent standard amendments for water in the Sangamon River Basin /

"November 1986."

Economic impact of a suspension of Rule 203 as it applies to an unnamed tributary of the Vermilion River, Vermilion County, Illinois /

"Project no. 80.159."

Economic impact of allowing open burning in disaster areas, R78-2 /

"Project officer: Michael H. Friedman."

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.