TY  - BOOK
ED  - American Water Works Association.
TI  - Water quality and treatment
AV  - TD430 A54 1951
PY  - 1951///
CY  - New York, N. Y.
PB  - American Water Works
N1  - Contiene dos folletos : water quality and treatment, filtration; Bibliografia: p. 425-431
ER  -