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Creator Personal Names
Selvig, W. A. (Walter Alfred), 1886-1972.
Remove constraint Creator Personal Names: Selvig, W. A. (Walter Alfred), 1886-1972.
All Creators
Selvig, W. A. (Walter Alfred), 1886-1972.
Remove constraint All Creators: Selvig, W. A. (Walter Alfred), 1886-1972.
Subject Topical
Coal dust--Analysis.
Remove constraint Subject Topical: Coal dust--Analysis.
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