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Creator Personal Names
Peng, Syd S., 1939-
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All Creators
Peng, Syd S., 1939-
Remove constraint All Creators: Peng, Syd S., 1939-
Subject Topical
Coal mines and mining--Research.
Remove constraint Subject Topical: Coal mines and mining--Research.
Subject Topical
Coal mines and mining--Safety measures.
Remove constraint Subject Topical: Coal mines and mining--Safety measures.
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