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- 40026890 contributor B968931.
- 40026890 contributor B968932.
- 40026890 contributor B968933.
- 40026890 created "1940.".
- 40026890 date "1940".
- 40026890 date "1940.".
- 40026890 dateCopyrighted "1940.".
- 40026890 extent "vii, 74 p. incl. illus., tables, diagrs.".
- 40026890 isPartOf "Public health bulletin no. 250".
- 40026890 issued "1940".
- 40026890 issued "1940.".
- 40026890 language "eng".
- 40026890 publisher "Washington, Govt. Print. Off.,".
- 40026890 subject "613.63".
- 40026890 subject "HD7264 .U6 1940".
- 40026890 subject "Lungs Dust diseases.".
- 40026890 subject "Mica.".
- 40026890 subject "Pegmatites.".
- 40026890 title "Pneumoconiosis among mica and pegmatite workers ... From the Division of Industrial Hygiene, National Institute of Health. Prepared by direction of the surgeon general.".
- 40026890 type "text".