TY  - BOOK
AU  - Duncan,Ernest R.
ED  - Houghton Mifflin and Company
TI  - Houghton mifflin mathematics: teacher΄s resource book level 2 
SN  - 0395358523
U1  - 372.7 23
PY  - 1985///.
CY  - Boston: 
PB  - Houghton Mifflin, 
KW  - Mathematics
KW  - Study and teaching (Elementary)
ER  -