III · Science
Progress in Slow Sand and Alternative Biofiltration Processes
Subjects
Water, purification · Water · Congresses · Purification · Slow sand filtration · Fixed-film biological process
Language
ENG
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![Cover of [William Wheeler Hubbell, authorized to apply for patents.] by United States. Congress. Senate. Committee on Patents](https://covers.openlibrary.org/b/id/10200621-M.jpg)
