TY  - BOOK
AU  - Osborn,Roger
AU  - DeVault,M.Vere
TI  - Extending mathematics understanding
AV  - QA135.5 .O76 1961 
PY  - 1961///
CY  - Columbus, Ohio
PB  - C. E. Merrill Books
KW  - Mathematics
KW  - Study and teaching (Elementary)
N1  - Earlier ed. copyright 1960 under the titles Toward improved understanding of mathematics, part I and Toward improved understanding of mathematics, part II, by M. V. DeVault, published in 1960; Revised in 1969, published separately in two volumes under the titles Understanding the number system and Extending understandings of mathematics; Bibliography: p. 264-271
ER  -