Hagan, Harold Raymond, 1886- Embryology of the viviparous insects. - New York, Ronald Press [1951] - xiv, 472 p. illus. 24 cm. LCCN: 51013040 Subjects--Topical Terms: Insects--Embryology.Insetos--Embriologia LC Class. No.: QL958 / .H23 Dewey Class. No.: 591.33