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- catalog contributor b8838318.
- catalog created "1923]".
- catalog date "1923".
- catalog date "1923]".
- catalog dateCopyrighted "1923]".
- catalog description "Bibliography: p.113-115.".
- catalog extent "150p.".
- catalog isPartOf "Bulletin (Illinois State Water Survey) ; 18.".
- catalog isPartOf "Bulletin no.18".
- catalog issued "1923".
- catalog issued "1923]".
- catalog language "eng".
- catalog publisher "Urbana, Illinois. [Springfield, Illinois state register printers".
- catalog subject "Sewage Purification.".
- catalog title "Activated sludge studies, 1920-1922. (Printed by authority of the state of Illinois)".
- catalog type "text".