scholarly journals Geologic map and digital database of the Porcupine Wash 7.5 minute Quadrangle, Riverside County, southern California

2001 ◽  
Author(s):  
Robert E. Powell
2003 ◽  
Author(s):  
Douglas M. Morton ◽  
Michael P. Kennedy ◽  
Kelly R. Digital preparation by Bovard ◽  
Diane Burns

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