00572cam a2200193 4500 55681506 TxAuBib 20000905120000.0 990618s1989||||||||||||||||||||||||und|u 9780395482971 0395482976 TxAuBib Douglass, Jackie Leatherbury. Peterson First Guide to Shells of North America. New York : Houghton Mifflin Co, 1989. 250p. 19990618. Shells North America Identification.