Text ( visual ) : unmediated Biotic diversity and germplasm preservation, global imperatives : invited papers presented at a symposium held May 9-11, 1988, at the Beltsville Agricultural Research Center, Beltsville, Maryland / Lloyd Knutson and Allan K. Stoner, editors ; sponsored by the Beltsville Agricultural Research Center, Agricultural Research Service, United States Department of Agriculture with the cooperation of Friends of Agricultural Research Beltsville, Inc., and the assistance of Committee on Managing Global Genetic Resources, Board of Agriculture, National Research Council. -- Dordrecht [Netherlands] ; Boston : Kluwer Academic Publishers , c1989. -- xxii, 530 p. : ill. ; 25 cm. -- (Beltsville symposia in agricultural research ; 13). -- Includes bibliographical references and index. -- ISBN 0792301781 ; (BA10278390) ; https://ci.nii.ac.jp/ncid/BA10278390 Author Heading(s): Knutson, Lloyd V. ; Stoner, Allan K. ; Beltsville Agricultural Research Center ; Friends of Agricultural Research Beltsville, Inc.. -- Classification(s): LCC : QH75.A1 ; DC19 : 333.95/16. -- Subject Heading(s): LCSH : Biological diversity conservation -- Congresses ; LCSH : Germplasm resources -- Congresses ; LCSH : Nature conservation -- Congresses