Biosystematics in agriculture : invited papers presented at a symposium held May 8-11, 1977, at the Beltsville Agricultural Research Center (BARC), Beltsville, Maryland
· organized by the BARC Symposium II Committee ; Lloyd Knutson, chairman ; sponsored by the Beltsville Agricultural Research Center, Northeastern Region, Agricultural Research Service, United States Department of Agriculture
Bok Engelsk 1978