Ryland, J. S. Bryozoans / J.S. Ryland. - London : Hutchinson University Library, 1970. - 175 p. : ill. ; 22 cm. - Hutchinson university library. Biological sciences . - Hutchinson university library. . Includes index. ISBN: 0091038707 0091038715 (pbk.) Subjects--Topical Terms: Bryozoa.Bryozoa, Fossil. Dewey Class. No.: 594.7 / RYB 1970