TY  - BOOK
AU  - Gray,Dwight E.
TI  - Man and his physical world
U1  - 500 
PY  - 1946/// [Reprinted 1950]
CY  - New York
PB  - D. Van Nostrand Company, inc.
KW  - Science
N1  - Charts on lining-papers; "Reading list": p. 671-680; Includes index
ER  -