Peterson, Daniel L. Functional mathematics for the mentally retarded [by] Daniel L. Peterson. - Columbus, Ohio Merrill [1973] - xvii, 679 p. illus. 24 cm. - The Slow learner series . Includes bibliographies. ISBN: 0675090970 LCCN: 70188780 Subjects--Topical Terms: Mentally handicapped children--Education--Mathematics. LC Class. No.: LC4621 / .P47 Dewey Class. No.: 372.9/28