TY  - BOOK
AU  - Betz,Frederick -ed
AU  - Betz,Frederick
TI  - Environmental geology
SN  - 0470071702
U1  - 550 BET  
PY  - 1975///.
CY  - Pennsylvania : 
PB  - Dowden, Hutchinson and Ross, 
KW  - Geology
N1  - Includes index
ER  -