TY  - BOOK
AU  - Balthaser H, 
TI  - Two Say Why
U1  - 521.18 
PY  - 1976///
CY  - New York
PB  - Sheed and Ward
KW  - GENERAL STACK
KW  - NATURAL SCIENCE& MATHEMATICS
KW  - ASTRONOMY & ALLIED SCIENCE
KW  - CELESTIAL MECHANICSGeneralia
ER  -