Spross, Patricia McNitt 1913- creator text bibliography dcu Washington U.S. Dept. of Health, Education, and Welfare, Office of Education ; [for sale by the Superintendent of Documents, U.S. Govt. Print. Off. 1965 monographic eng

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vi, 134 p. : ill. ; 26 cm. by Patricia M. Spross. "OE-29063." L111.A72 no. 784 bound with Circular no. 785-no. 789 subsequent to publication. Bibliography: p. 129-134. Arithmetic Study and teaching (Elementary) Mathematics Study and teaching (Elementary) Teaching Aids and devices L111 .A72 no. 784 hew66000030 U.S. Dept. of Health, Education, and Welfare. Library 721229 20260227111514.0 hew66000030