Reys, Robert E. Activity cards for Helping children learn mathematics, fourth edition / Robert E. Reys, Marilyn N. Suydam, Mary M. Lindquist - Boston : Allyn and Bacon, 1995 - 1 v. (various pagings) : ill. ; 28 cm. ISBN: 0205164706 RM121.44 Subjects--Topical Terms: Mathematics--Study and teaching (Elementary)