01370oam 2200433 a 450 991070221320332120121107162427.0(CKB)5470000002426020(OCoLC)464239137(EXLCZ)99547000000242602020091109d1973 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierFreshwater triclads (Turbellaria) of North America, V[electronic resource] the genus PolycelisWashington, D.C. :Smithsonian Institution Press,1973.1 online resource (iii, 15 pages) illustrationsSmithsonian contributions to zoology ;no. 135Title from title screen (viewed Nov. 9, 2009).Includes bibliographical references (pages 14-15).Freshwater triclads PolycelisTurbellariaNorth AmericaPolycelis.TurbellariaKenk Roman1898-1988.1399014Smithsonian Institution.MUUMUUOCLCQCUSOCLCQGPOBOOK9910702213203321Freshwater triclads (Turbellaria) of North America, V3517897UNINA