Agricultural productivity and environmental quality : joint hearings before the Subcommittee on Natural Resources and Environment of the Committee on Science and Technology and the Subcommittee on Conservation and Credit of the Committee on Agriculture, U.S. House of Representatives, Ninety-sixth Congress, first session, July 25, 26, 1979
OCLC: 6598076 ;LCCN: 80602181 //r90
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