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- U.S. Geological Survey open-file report134
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- Open file report (United States. Bureau of Mines)8
- [OFR7
- Open-file report (Geological Survey (U.S.))6
- S. hrg3
- United States. Congress. Senate3
- Bureau of Mines special publication1
- CIHM/ICMH microfiche series1
- Geologic investigations series1
- Information circular1
- Information circular (United States. Bureau of Mines)1
- Miscellaneous field studies1
- Open file report1
- Report / 97th Congress, 2d session, Senate1
- Report / 99th Congress, 1st session, House of Representatives1
- Report of investigations1
- Report of investigations (United States. Bureau of Mines)1
- U.S. Geological Survey circular1
- USGS open-file report1