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Why are some of the historical topographic maps yellowed and why do some have extra stamps or marks?

The goals of the Historical Topographic Map Collection (HTMC) project are to find, catalog, and georeference all USGS topographic quadrangle maps published prior to 2007. The overall purpose is to preserve the map archive for scientists, historians, and the public. Library copies of maps (many of which have library stamps) were therefore scanned "as is". Map restoration is not part of the current HTMC project.