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==Useful links==
==Useful links==
* [https://www.google.com/maps/views/streetview/oceans?gl=us Google Street View of the Great Barrier Reef]
* [https://www.google.com/maps/views/streetview/oceans?gl=us Google Street View of the Great Barrier Reef]
* [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] A significant part of 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.<ref>Salvador, A., 1982, Wallace Everett Pratt: AAPG Bulletin, vol. 66, no. 9, p. 1412-1422.</ref>
==References==
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