TY  - BOOK
AU  - Nichols,Eugene D.
TI  - Elementary mathematics: Patterns and structure 
U1  - 513.07 1.1.029(a)
PY  - 1966///
CY  - Estados Unidos de América
PB  - Holt, Rinehart and Winston, Inc.
KW  -  STUDY AND TEACHING (PRIMARY)
KW  - MATHEMATICS
N1  - NUMBERS AND NUMBER NAMES - ADDITION AND SUBTRATION - OUR SYSTEM OF NUMERATION
ER  -