Spencer, Peter Lincoln
Building mathematical concepts in the elementary school by Peter Lincoln Spencer [and] Marguerite Brydegaard - 1st ed. - New York Holt, Rinehart and Winston 1952 - 372 p. illus. 22 cm.
Arithmetic concepts
511 / SPE/1952
Building mathematical concepts in the elementary school by Peter Lincoln Spencer [and] Marguerite Brydegaard - 1st ed. - New York Holt, Rinehart and Winston 1952 - 372 p. illus. 22 cm.
Arithmetic concepts
511 / SPE/1952