Directory - Illinois Department of Transportation.

Mode of access: Internet.

Downstate public transportation operating assistance program / Illinois Department of Transportation.

Mode of access: Internet.

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

"July, 1981."

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 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 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 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 study of proposed airport noise regulations, R77-4 /

"January 1981."

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

"Project no. 30.017."

Economic impact of the proposed change in the hydrocarbon emission limitation for petrochemical manufacturing processes (R77-3) /

Project no. 10.065.

Energy and labor cost of alternative coal-electric fuel cycles /

"Project no. 80.172."