Metal Detecting Map Resources to help with recon before you go into the field!
Historic Aerials Ariel views of most addresses in the U.S. dating back to the 50’s with interesting overlays.
Historic Map Works Find old maps and overlay them onto Google maps.
MyTopo Index of States and towns with an index of 15" quadrangles.
Civil War Traveler Trail maps of the Civil War.
Maryland Civil War research Where to find archival maps for Maryland.
PBS Civil War maps Maps of significant battles in the Civil War.
Baltimore County 1877 Historical atlas of Baltimore County. Author, Hopkins, G.M.