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* [http://pubs.usgs.gov/of/1999/ofr-99-0050/OF99-50A/fig6a.html USGS - Red Sea]
 
* [http://pubs.usgs.gov/of/1999/ofr-99-0050/OF99-50A/fig6a.html USGS - Red Sea]
 
* [http://www.gsa.state.al.us/documents/pubs/onlinepubs/Circulars/C_187.PDF Alabama Survey - Black Warrior Basin] (page 6)
 
* [http://www.gsa.state.al.us/documents/pubs/onlinepubs/Circulars/C_187.PDF Alabama Survey - Black Warrior Basin] (page 6)
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