TY  - BOOK
AU  - Landsberg,Hans A.
AU  - Revelle,Roger
TI  - America's changing environment
U1  - 309.173/ROA 
PY  - 0000/// Beason
PY  - 1970///
CY  - Boston
KW  - U.S. Social conditions.
KW  - Human ecology.	
N1  - Includes index and Bibliography and Glossary
ER  -