Elementary arithmetic and learning aids - Spross, Patricia McNitt, 1913- (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)
"OE-29063."
L111.A72 no. 784 bound with Circular no. 785-no. 789 subsequent to publication.
Bibliography: p. 129-134.
Keywords: Arithmetic -- Study and teaching (Elementary); Mathematics -- Study and teaching (Elementary); Teaching -- Aids and devices