U.S. Dept. of Agriculture, Agricultural aResearch Service ; National Technical Information Service, distributor,

Center for Environmental Research Information, National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,

The Forum : U.S. Dept. of Justice, Office of Justice Programs, Office for Victims of Crime,

U.S. Environmental Protection Agency, Office of Research and Development, Center for Environmental Research Information, National Risk Management Research Laboratory,

U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory,

U.S. Environmental Protection Agency, Office of Research and Development, Center for Environmental Research Information, National Risk Management Research Laboratory,

U.S. Dept. of Justice, Office of Justice Programs, Office of Juvenile Justice and Delinquency Prevention,

U.S. Dept. of Agriculture, Agricultural Research Service : For sale by the U.S. G.P.O., Supt. of Docs.,

Center for Environmental Research Information : Office of Research and Development, U.S. Environmental Protection Agency,

U.S. Dept. of Education, Office of Educational Research and Improvement : For sale by the U.S. G.P.O.,

The Bureau,

U.S. Dept. of Commerce, National Technical Information Service,