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- 78612080 contributor B3456123.
- 78612080 created "1971]".
- 78612080 date "1971".
- 78612080 date "1971]".
- 78612080 dateCopyrighted "1971]".
- 78612080 description "Bibliography: p. 25.".
- 78612080 extent "32 p.".
- 78612080 isPartOf "Information circular (United States. Bureau of Mines) ; 8507.".
- 78612080 isPartOf "[United States. Bureau of Mines] Information circular ; 8507".
- 78612080 issued "1971".
- 78612080 issued "1971]".
- 78612080 language "eng".
- 78612080 publisher "[Washington] U.S. Bureau of Mines; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.,".
- 78612080 spatial "Pennsylvania.".
- 78612080 subject "622/.08 s".
- 78612080 subject "Coal mines and mining Pennsylvania.".
- 78612080 subject "Mining engineering.".
- 78612080 subject "Subsidences (Earth movements)".
- 78612080 subject "TN295 .U4 no. 8507".
- 78612080 title "Mine subsidence--extent and cost of control in a selected area.".
- 78612080 type "text".