TY  - BOOK
AU  - Helweg, Otto J.
AU  - Scalmanini, Joseph C.
AU  - Scott, Verve H.
TI  - Improving Well and Pump Efficiency 
SN  - 0898672848
U1  - 628.114 
PY  - 1983///
CY  - Denver : 
PB  - American Water Works Association, 
KW  - Pump
KW  - Wells
N1  - NN
UR  - https://eaklibrary.neduet.edu.pk:8443/catalog/bk/books/toc/0-89867-284-8.pdf
ER  -