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- 68061668 contributor B1871171.
- 68061668 created "1967.".
- 68061668 date "1967".
- 68061668 date "1967.".
- 68061668 dateCopyrighted "1967.".
- 68061668 extent "26 p.".
- 68061668 issued "1967".
- 68061668 issued "1967.".
- 68061668 language "eng".
- 68061668 publisher "Chicago,".
- 68061668 spatial "Great Lakes Region (North America)".
- 68061668 subject "628/.168/0977".
- 68061668 subject "TD223.3 .A47 1967".
- 68061668 subject "Water Pollution Great Lakes Region (North America)".
- 68061668 title "Water pollution problems of the Great Lakes area.".
- 68061668 type "text".