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Schrenk, H. H. (Helmuth Herman), 1902-
Remove constraint All Creators: Schrenk, H. H. (Helmuth Herman), 1902-
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Coal miners--Diseases.
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Silicosis.
Remove constraint All Subjects: Silicosis.
Subject Topical
Dust control.
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Lungs--Dust diseases.
Remove constraint Subject Topical: Lungs--Dust diseases.
Subject Topical
Silicosis.
Remove constraint Subject Topical: Silicosis.
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