Atlas of Historical County Boundaries
http://publications.newberry.org/ahcbp/
Atlas of the Historical Geography of the United States (1932)
http://dsl.richmond.edu/historicalatlas/
County Boundaries–Newberry
David Rumsey Map Collection
http://www.davidrumsey.com
Deed Mapper maps
http://www.directlinesoftware.com/pool.htm
Draw Radius circles on a map
obeattie.github.io/gmaps-radius/?radiusInput=125&unitSelector=mi&lat=51.500358&lng=-0.125506&z=10&u=mi&r=5
DIY Maps
http://www.diymaps.net/index.htm
GeoCommunicator
http://www.geocommunicator.gov/blmMap/MapLSIS.jsp
Georgia Maps
http://cdm.sos.state.ga.us:8888/cdm4/hmf.php
History Geo
http://www.historygeo.com
Historic Map Works
http://www.historicmapworks.com/
Historical Atlases and Maps of US
http://www.mapofus.org
Map Pass
http://map-pass.mytopo.com
Migration
www.unz.com/jman/the-genetics-of-the-american-nations/
MyTopo
http://www.mytopo.com
National Archives
NC State Historic Preservation Office
http://gis.ncdcr.gov/hpoweb/
Old Maps Online
http://www.oldmapsonline.org
Randy Majors
http://www.randymajors.com/p/maps.html
Sanborn Maps
http://www.loc.gov/rr/geogmap/sanborn/
TOPO Maps
www.natgeomaps.com/trail-maps/pdf-quads
US GenWeb Digital Map Library
http://usgwarchives.org/maps/