Osborn, Roger ...[et al]
Extending mathematics understanding / Roger Osborn ...[et al] - Columbus : C. E. Merrill Books, c 1961. - 278 p. : ill. : 24 cm.
Bibliography : p. 264-271.
339 339
Mathematics--Study and teaching (Elementary)
510 / O2e
Extending mathematics understanding / Roger Osborn ...[et al] - Columbus : C. E. Merrill Books, c 1961. - 278 p. : ill. : 24 cm.
Bibliography : p. 264-271.
339 339
Mathematics--Study and teaching (Elementary)
510 / O2e