TY  - BOOK
AU  - Duncan, Ernest R.
TI  - Mathematics
SN  - 0395254655
U1  - 510 
PY  - 1978///
CY  - Boston
PB  - Houghton Mifflin Company
KW  - Mathematics
KW  - Mathematics--Study and teaching (Elementary)
KW  - Arithmetic
KW  - Arithmetic--Study and teaching (Elementary)
KW  - Mathematics--Study and teaching
KW  - Mathematics--Study and teaching (Primary)
N1  - Include Index
ER  -