TY  - BOOK
AU  - 
AU  - 
ED  - 
ED  - 
ED  - 
ED  - 
TI  - : principles and concepts 
SN  - 2
PY  - 1982///46
CY  - St. Louis, MO
PB  - The C.V. Mosby Co
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
N1  - 5
ER  -