TY  - BOOK
ED  - Houghton Mifflin and Company
TI  - Solution key: level 7
T2  - Houghton Mifflin Mathematics
SN  - 0395387388
U1  - 510 23
PY  - 1987///.
CY  - Boston: 
PB  - Houghton Mifflin Company, 
KW  - Mathematics
KW  - Problems, exercises, etc
ER  -