Guide to research in air pollution :
projects active in calendar year 1969 /
compiled by Center for Air Environment Studies of the Pennsylvania State University.

APA Citation

United States. National Air Pollution Control Administration., Pennsylvania State University. Center for Air Environment Studies. (1970). Guide to research in air pollution: projects active in calendar year 1969. 7th ed. Raleigh, N.C.: U.S. Dept. of Health, Education and Welfare, Public Health Service, Environmental Health Service, National Air Pollution Control Administration.

MLA Citation

United States. National Air Pollution Control Administration, and Pennsylvania State University. Center for Air Environment Studies. Guide to Research In Air Pollution: Projects Active In Calendar Year 1969. 7th ed. Raleigh, N.C.: U.S. Dept. of Health, Education and Welfare, Public Health Service, Environmental Health Service, National Air Pollution Control Administration, 1970.

Warning: These citations may not always be complete (especially for serials).