McGregor, Samuel Emmett
Insect pollination of cultivated crop plants / Samuel Emmett McGregor - Washington, D.C. : USDA , 1976 - viii, 411p. : ill. ; 30 cm. - Agricultural handbook .
Includes bibliographical references and index.
Pollination by insects
Plants, Cultivated
Agricultural economics
Insects
632.7 / MCG
Insect pollination of cultivated crop plants / Samuel Emmett McGregor - Washington, D.C. : USDA , 1976 - viii, 411p. : ill. ; 30 cm. - Agricultural handbook .
Includes bibliographical references and index.
Pollination by insects
Plants, Cultivated
Agricultural economics
Insects
632.7 / MCG