Free, John Brand. Insect pollination of crops, by John B. Free. - London, New York, Academic Press, 1970. - xi, 544 p. illus. 24 cm. Bibliography: p. [444]-506. ISBN: 012266650X LCCN: 72117141 Nat. Bib. No.: B*** Subjects--Topical Terms: Pollination by insects.Field crops. Dewey Class. No.: 597.7