Origin Inc. : Distributed by Tech Line Corp.,

Published for the Federal Trust for Education and Research, London, by Praeger

The Laboratory,

Johns Hopkins University Press,

U.S. Environmental Protection Agency, Environmental Research Laboratory,

U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, National Severe Storms Laboratory ; for sale by the National Technical Information Service,

Consortium for Policy Research in Education, Rutgers, the State University of New Jersey ; U.S. Dept. of Education, Office of Educational Research and Improvement, Educational Resources Information Center,

Giramondo Publishing Company,

[U.S. Environmental Protection Agency]; for sale by the Supt. of Docs., U.S. Govt. Print. Off.,

[Environmental Protection Agency, Water Quality Office]; for sale by the Supt. of Docs., U.S. Govt. Print. Off.,

Westland Publications,