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You searched for: 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--Analysis. Remove constraint All Subjects: Coal dust--Analysis.

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