USGS Open House 2012

May 19-20, 2012

This is the tenth triennial event

Photographs of just the Mount Diablo Surveyors Historical Society portion of exhibit

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120519-7534_USGS_Open_House_2012

- All photographs ©2012 Mike Diggins, USGS Western Publications Group.

MDSHS - Mount Diablo Surveyors Historical Society
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