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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
Greenwald, H. P. (Harold Putnam), 1893-
Remove constraint All Creators: Greenwald, H. P. (Harold Putnam), 1893-
All Subjects
Coal dust--Sampling.
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