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- 31028677 contributor B780872.
- 31028677 contributor B780873.
- 31028677 contributor B780874.
- 31028677 created "1931.".
- 31028677 date "1931".
- 31028677 date "1931.".
- 31028677 dateCopyrighted "1931.".
- 31028677 extent "iii, 30 p. incl. illus., maps, tables.".
- 31028677 isPartOf "U.S. Bureau of mines. Technical paper, 506".
- 31028677 issued "1931".
- 31028677 issued "1931.".
- 31028677 language "eng".
- 31028677 publisher "Washington, U.S. Govt. print. off.,".
- 31028677 spatial "Kentucky Letcher County.".
- 31028677 subject "Coal Kentucky Letcher County.".
- 31028677 subject "Microscopy.".
- 31028677 subject "TN1 .U6 no. 506".
- 31028677 title "Microscopic study of Elkhorn coal bed at Jenkins, Letcher county, Ky., by Reinhardt Thiessen, George C. Sprunk, and H.J. O'Donnell ...".
- 31028677 type "text".