Sporne, K. R. The morphology of gymnosperms : the structure and evolution of primitive seed-plants / K. R. Sporne - London : Hutchinson University Library, 1965 - 216 p. : ill. ; 20 cm. Imprint covered by label, New York, Hillary House. Bibliography : p. 199-210. ISBN: 0090771516 LCCN: 66-001105 Subjects--Topical Terms: GymnospermsBotany--Morphology