TY  - BOOK
ED  - American Public Health Association
ED  - American Water Works Association.
TI  - Selected analytical methods approved and cited by the United States Environmental Protection Agency
U1  - C 628.161 
PY  - 1981///
CY  - Washington
PB  - American Public Health Association, 
KW  - AGUA
KW  - ANALISIS
N1  - Supplement to the fifteenth edition of Standard methods for examination of water and wastewater
ER  -