How 'old' is 'old'? They have BW stuff taken from Civil War balloons. These? https://lta.cr.usgs.gov/DOQs and https://lta.cr.usgs.gov/NAPP Supposedly via Earth Explorer, but your mileage may vary. I have had better luck usually through state archives.
One way is through USDA Natural Resources Conservation Service The Geospatial Data Gateway (GDG) at http://datagateway.nrcs.usda.gov/ , from the right, for instance, 'Order by County/Counties' <http://datagateway.nrcs.usda.gov/GDGOrder.aspx> gives: WHAT Here are the available map layers for your selected area of interest. Ortho Imagery Digital Ortho County Mosaic of 7.5' quads by NRCS, 1 map 921.436 MB 2004 National Ag. Imagery Program Mosaic, 1 map 47.008 MB 2005 National Ag. Imagery Program Mosaic, 1 map 245.845 MB 2006 National Ag. Imagery Program Mosaic, 1 map 1908.170 MB 2009 National Ag. Imagery Program Mosaic, 1 map 1837.978 MB 2011 National Ag. Imagery Program Mosaic, 1 map 1837.755 MB 2013 National Ag. Imagery Program Mosaic, 1 map 1838.053 MB Easier to answer if one knows your specific intent or analysis task. Michael Patrick <http://datagateway.nrcs.usda.gov/GDGOrder.aspx>
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