635.933 B Bowers, Clement Gray, 1893-- Rhododendrons and azaleas; their origins, cultivation and development; with illustrations in color by Frank Taylor Bowers and pen drawings by the author. New York, The Macmillar company, 1936. xiv p., 1 1., 549 p. col. front., illus, plates (part color ) 26 cm. Maps on linin-papers. bibliografia p. 503-511