Slow sand filtration : manual for caretakers / J. T Visscher and S. Veenstra with illustrations by A. Figee.
Visscher, J. T
Veenstra, S
The Hague,The Netherlands, 1985.
69, [4] p. ; 25 cm.
Water - Furification - Sand filtration
Drinking water
ENG
Drinking water
ENG
B 16.31 VIS -12498
12498