Ruedemann, Rudolf Paleozoic plankton of North Amrica. - Washington : Geol.Soc.of America, 1934. - 138 p. : il. ; 25 cm Subjects--Topical Terms: PaleontologĂaPaleozoicoPlancton Subjects--Geographic Terms: AmĂ©rica del Norte Index Terms--Genre/Form: Libro Universal Decimal Class. No.: 56(73)