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Creator Personal Names
Phelps, Harvey W.
Remove constraint Creator Personal Names: Phelps, Harvey W.
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Coal mines and mining--Rocky Mountain Regions.
Remove constraint All Subjects: Coal mines and mining--Rocky Mountain Regions.
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Lungs--Dust diseases.
Remove constraint All Subjects: Lungs--Dust diseases.
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Coal miners--Diseases--Rocky Mountain Regions.
Remove constraint Subject Topical: Coal miners--Diseases--Rocky Mountain Regions.
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