www.pasda.psu.edu - /download/US_Topo_GeoPDFs/Historic/

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  3/5/2012 12:28 PM       988651 Scanning and Georeferencing Historical USGS Quadrangles fs20113009_sept2011.pdf
  3/5/2012 12:40 PM       799190 Standards for Scanned USGS Historical Topographic Quadrangle Collection 2011 TM11-B3.pdf
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