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- U.S. Geological Survey70
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- Comissão da Carta Geológica do Paraná2
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- Bundesanstalt für Bodenforschung ; UNESCO1
- Geological Survey of Alabama1
- Geological Survey of Canada1
- Illinois State Geological Survey1
- Printed by the Government Printer1
- Published by the Alberta Society of Petroleum Geologists for the Devonian Symposium1
- Serviços Geológicos1
- Tennessee Division of Geology1
- University of the State of New York, State Education Dept1
