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- 71605728%2F%2Fr982 contributor B2050199.
- 71605728%2F%2Fr982 contributor B2050200.
- 71605728%2F%2Fr982 contributor B2050201.
- 71605728%2F%2Fr982 created "1969]".
- 71605728%2F%2Fr982 date "1969".
- 71605728%2F%2Fr982 date "1969]".
- 71605728%2F%2Fr982 dateCopyrighted "1969]".
- 71605728%2F%2Fr982 description "Bibliography: p. 31.".
- 71605728%2F%2Fr982 extent "32 p.".
- 71605728%2F%2Fr982 isPartOf "Information circular (United States. Bureau of Mines) ; 8436.".
- 71605728%2F%2Fr982 isPartOf "United States. Bureau of Mines. Information circular ; 8436".
- 71605728%2F%2Fr982 issued "1969".
- 71605728%2F%2Fr982 issued "1969]".
- 71605728%2F%2Fr982 language "eng".
- 71605728%2F%2Fr982 publisher "[Washington] U.S. Bureau of Mines; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.,".
- 71605728%2F%2Fr982 subject "622/.08 s".
- 71605728%2F%2Fr982 subject "Breathing apparatus.".
- 71605728%2F%2Fr982 subject "Mine safety.".
- 71605728%2F%2Fr982 subject "TN295 .U4 no. 8436".
- 71605728%2F%2Fr982 title "Respiratory protective devices approved by the Bureau of Mines as of December 31, 1968, by R. H. Schutz and E. J. Kloos.".
- 71605728%2F%2Fr982 type "text".