TY  - BOOK
AU  - Gray,Dwight E
TI  - Man and his physical world
U1  - 500.2 GRA 
PY  - 1946///.
CY  - New York : 
PB  - D. Van Nostrand company, 
KW  - Physics
KW  - Science- Methodology
KW  - Solar system
KW  - Space science
ER  -