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Start Over Authors Illinois State Water Survey, author, issuing body. ✖Remove constraint Authors: Illinois State Water Survey, author, issuing body. Dates by Range 1900-1949 ✖Remove constraint Dates by Range: 1900-1949

1. Activated sludge studies, 1920-1922

Author(s):
Illinois State Water Survey, author, issuing body.
Publication:
Urbana, Illinois : State of Illinois, Department of Registration and Education, Division of the State Water Survey, [1923]
Subject(s):
Sewage
Water Purification
Illinois

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