Hyman, Libbie Henrietta The Invertebrates : Volume 2. Platyhelminthes and Rhynchocoela: the acoelomate Bilateria/ by Libbie Henrietta Hyman - New York: McGraw-Hill Book Co., 1951. - vii,550p. ISBN: 070316619 Subjects--Topical Terms: Invertebrates Zoology Dewey Class. No.: 592 / HYM/I V.2