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Line 5: − + − * [https://en.wikipedia.org/wiki/Reef Wikipedia article]+
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* [http://en.wikibooks.org/wiki/Historical_Geology/Reefs Good definition of reefs in a geologic rather than nautical sense]
* [http://en.wikibooks.org/wiki/Historical_Geology/Reefs Good definition of reefs in a geologic rather than nautical sense]
* [http://www.sunstar-solutions.com/sunstar/geology/Permian/PermianTX.htm Permian reefs in west Texas, USA]
* [http://www.sunstar-solutions.com/sunstar/geology/Permian/PermianTX.htm Permian reefs in west Texas, USA]
* [http://www.nps.gov/gumo/naturescience/geologicformations.htm Permian Reefs in Guadalupe Mountains National Park, Texas, USA] Much of this park was donated to the country by Wallace Pratt, one of the founders of AAPG.
* [http://www.nps.gov/gumo/naturescience/geologicformations.htm Permian Reefs in Guadalupe Mountains National Park, Texas, USA] A significant part of of this park was donated to the country by Wallace Pratt, one of the founders of AAPG.
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