Attention #Genealogy nerds who love using #Maps for research: USGS Publication: Scanning and georeferencing historical USGS quadrangles https://t.co/PsS6JMCAYc via @USGS_Pubs
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RT @USGS: Scanning and georeferencing historical USGS quadrangles Fact Sheet 2017-3048 https://t.co/vdaEU80VC0 https://t.co/orCp1Ny5yI
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RT @USGSTNM: Updated Historical Topographic Map Collection Fact Sheet published: https://t.co/EGqGLEp8L6. #mapping the Nation. #USGS https:…
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Updated Historical Topographic Map Collection Fact Sheet published: https://t.co/EGqGLEp8L6. #mapping the Nation. #USGS https://t.co/VcqO1c9Ppy