TY  - BOOK
AU  - Ehlers, Victor Marcus,
AU  - Steel, E. W.
ED  - 
ED  - 
ED  - 
ED  - 
SN  - 2
PY  - 1976///;copyright 1965.46
CY  - New York
PB  - McGraw-Hill
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
KW  - Sanitation.;Sanitary engineering.;Public health.;Rural health
N1  - Includes bibliographies; 5
ER  -