1996. Aerospace Center (U.S.). This layer is a georeferenced raster image of the United States Aerospace Center's Tactical Pilotage Chart (TPC) 1:500,000 map series sheet entitle... Harvard Map Collection, Harvard College Library.
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1995. Aerospace Center (U.S.). This layer is a georeferenced raster image of the United States Aerospace Center's Operational Navigation Chart (ONC) 1:1,000,000 map series sheet ... Harvard Map Collection, Harvard College Library.