Text ( visual ) : unmediated 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. -- Montclair, N.J. : Allanheld, Osmun & Co. ; New York : John Wiley & Sons , 1978. -- xi, 340 p. : ill. ; 24 cm. -- (Beltsville symposia in agricultural research ; 2). -- Includes bibliographies and indexes. -- ISBN 0470264160 ; (BA38311594) ; https://ci.nii.ac.jp/ncid/BA38311594 Author Heading(s): Knutson, Lloyd V. ; BARC Science Seminar Committee. -- Classification(s): LCC : QR51 ; DC : 630/.27/664. -- Subject Heading(s): LCSH : Agricultural virology -- Congresses

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