Crouch, Ralph Mathematics for elementary teachers/ [by] Ralph Crouch [and] George Baldwin. - New York: Wiley, [1964]. - ix, 352 p.: illus., 24 cm. LCCN: 64017136 Nat. Bib. No.: GB64-20497 Subjects--Topical Terms: Arithmetic---Foundations. Dewey Class. No.: 510.7 / C952m