TY  - BOOK
AU  - Helweg, Otto J.
AU  - Scalmanini, Joseph C.
AU  - Scott, Verne H.
TI  - Improving well and pump efficiency
U1  - 621.64 
PY  - 1984///
CY  - (s.l.)
PB  - American Water Works Association
KW  - Bombas mecánicas
KW  - Pozos
ER  -