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- Geological Survey (U.S.)38
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- Nordkalott Project2
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- Bundesanstalt für Bodenforschung1
- Lineback, Jerry Alvin, compiler1
- Muller, Ernest Hathaway, 1923-1
- New York State Geological Survey1
- Ohio. Division of Geological Survey1
- Romania. Comitetul Geologic1
- Serviços Geológicos de Portugal1
- Swinford, E. Mac1
