TY  - GEN
AU  - Spellmann, Frank R
TI  - Spellman's standard handbook for wastewater operators
SN  - 9781439818848
PY  - 2011///
CY  - Boca ration
PB  - CRC press
KW  - Sewage disposal - employees certification - handbooks
N1  - v.1. Fundamental level.-v.2. Intermediate level.-v.3. Advanced level
ER  -