Association of American Geographers - GIS AAG - Historical GIS Clearinghouse
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Afriterra-Cartographic Free Library
http://www.afriterra.org/

Alexandria Digital Library
http://www.alexandria.ucsb.edu

American Memory Project, Library of Congress
http://lcweb2.loc.gov/ammem/gmdhtml/gmdhome.html

Animated Atlas of African History 
http://www.brown.edu/Research/AAAH/index.htm

Atlas et Cartes Historiques
http://wwwens.uqac.ca/~a2cote/history.maps1.html

Batanes Islands Cultural Atlas
http://ecai.org/batanesatlas/index.html

The Canadian County Atlas Digital Project
http://digital.library.mcgill.ca/CountyAtlas/default.htm

Centennia Historical Atlas
http://www.clockwk.com/centennia.html

Cultural Atlas of Vietnamese Buddhism (CAVB)
http://www.vbu.edu.vn/?aacecom=view&code=detail&id=45

David Rumsey Map Collection
http://www.davidrumsey.com/

Digital Atlas of Ancient and Medieval Civilizations
medievalmap.harvard.edu à not yet public [ADDRESS NOT FOUND]

Digital Sandborn Maps 1867-1970
http://sanborn.umi.com/

Digital South Asia Library
http://dsal.uchicago.edu/maps/

The Electronic Atlas of Ancient Maya Settlements
http://mayagis.smv.org/

Electronic Cultural Atlas Initiative
http://www.ecai.org/

The Encyclopedia of Chicago, Full Maps Listing
http://www.encyclopedia.chicagohistory.org/pages/700011.html

Euratlas
http://www.euratlas.com/

Gallica
http://gallica.bnf.fr/

Hargrett Rare Book and Manuscript Library at the University of Georgia, Rare Map Collection
http://www.libs.uga.edu/darchive/hargrett/maps/maps.html

Harvard Map Collection’s Digital Collections
http://hcl.harvard.edu/libraries/maps/collections/digital.html#overview

Harvard Geospatial Library
http://dixon.hul.harvard.edu:8080/HGL/hgl.jsp

HistoricAerials
http://www.historicaerials.com/

Historical Atlas of Canada
http://www.historicalatlas.ca/website/hacolp/

Historical Atlas of South India
http://www.ifpindia.org/histatlas/
http://www.ifpindia.org/hatlas/

Historical Maps of the Arab World
http://www.al-bab.com/arab/maps/maps2.htm

Historical USGS Maps of New England and NY
http://docs.unh.edu/nhtopos/nhtopos.htm

Institute of European History Map Server (IEG-Maps)
http://www.ieg-maps.uni-mainz.de/

Irish Population Change Atlas and The Atlas of Irish Famine Data
http://ncg.nuim.ie/historical-atlas

Map Image Rendering Database for Geoscience (MIRAGE)
http://gdr.nrcan.gc.ca/mirage/index_e.php

Mapping Medieval Townscapes: Digital Atlas of new towns of Edward I
http://ads.ahds.ac.uk/catalogue/specColl/atlas_ahrb_2005/index.cfm

Maps of the French and Indian War
http://www.masshist.org/maps/MapsHome/Home.htm

The National Atlas
http://www.nationalatlas.gov/

The Newberry Library Atlas of Historical County Boundaries
http://www.newberry.org/ahcbp/

The Newberry Library Map and Cartography Collections
http://www.newberry.org/collections/mapoverview.html

NOAA Office of Coast Survey Historical Map and Chart Collection
http://www.nauticalcharts.noaa.gov/csdl/ctp/abstract.htm

Normal B. Leventhal Map Center at Boston Public Library
http://maps.bpl.org/view_collection/

OldAerialPhotos.com
http://www.oldaerialphotos.com/

The Online Map Digitization Project
http://www.rootsweb.ancestry.com/~canmaps/index.html

Perry-Castañeda Library Map Collection, historical maps
http://www.lib.utexas.edu/maps/historical/index.html

Ravenstein Atlas of the German Empire
http://www.library.wisc.edu/etext/ravenstein/

The Tibetan & Himalayan Library
http://thlib.org/

University of Alabama Historical Map Archive
http://alabamamaps.ua.edu/historicalmaps/

The W.H. Pugsley Collection of Early Canadian Maps
http://digital.library.mcgill.ca/pugsley/

World Digital Library Map Section
http://www.wdl.org/en/search/gallery?ql=eng&ty=Maps