Road Map Collectors of America:
RMCA is a group of road map collectors throughout North America and
Great Britain.
http://www.roadmaps.org
North Carolina Maps:
Digital scans of antique maps from the collection George A. Howard.
http://www.georgehoward.net/photo.htm
David Rumsey's Map Collection:
Over 6,000 high-resolution digital images of maps from the David
Rumsey Collection, one of the largest private collections of
historic maps in the US. Focus is 18th and 19th c. North and South
America cartographic materials.
http://www.davidrumsey.com/
International Map Collectors Society:
London-based organization for those interested in maps, including
collectors, dealers, librarians, and academics. Activities overview,
events calendar, journal, library, and resources.
http://www.harvey27.demon.co.uk/imcos/
International Antiquarian Mapsellers Association (IAMA):
The IAMA's main purpose is to promote the professional trade of
antiquarian, collectible maps and related books combined with
promoting public interest, appreciation and education with respect
to antiquarian maps.
http://www.antiquemapdealers.com/