Broer Map Library - Thousands of online historic maps. Includes searchable index of historic maps on over 100 other online collections. - http://www.broermapsonline.org/
Harvard University - Map Collection - Library history, general information, an overview of map collections, and an online exhibit of Civil War map images. - http://hcl.harvard.edu/libraries/#hmc
Texas A&M University Libraries - Maps/GIS Room - General information and collection overview. - http://library.tamu.edu/portal/site/Library/menuitem.fe0e0f414401262ebd078f3019008a0c/?vgnextoid=8361c35b248c0010VgnVCM1000007800a8c0RCRD
United States Geological Survey Library - General information, FAQ, and mapping information from "the largest earth science library in the world". - http://library.usgs.gov/
Middlebury College Library - Maps Collection Guide - Guide to map library resources. - http://www.middlebury.edu/academics/lis/lib/guides_and_tutorials/guides_to_collections/collection_guide-maps/data_resources_online_maps/
Maps, Plans and Charts - Provides access to item-level descriptions from the "old map card catalogue" of the National Archives of Canada. About 4,000 items have been digitized and may be consulted online. - http://www.collectionscanada.ca/archivianet/020154_e.html
Library of Congress - Geography and Map Division - History and background of the geography and map division, and reference services and guides. Includes a large, searchable collection of online North American maps in the public domain, dating from 1544 to present. - http://www.loc.gov/rr/geogmap/
University of Michigan - Map Library - General information, GIS tutorial, and links to other online resources. - http://www.lib.umich.edu/maplib/
University of Colorado at Boulder - Map Library - General information and tour, recent acquisitions, collection descriptions, and annotated links to map resources and digital spatial data. - http://ucblibraries.colorado.edu/map/index.htm
Michigan Library - Map Collection - Guide to finding maps and links to geographical resources. - http://www.michigan.gov/hal/0,1607,7-160-17449-56864--,00.html
Memorial University of Newfoundland - Map Library - General information, collection description and development policy, Newfoundland map bibliography, and map links. - http://www.library.mun.ca/qeii/maps/
Western Illinois University - Map Library - Basic information, collection descriptions, and four online global projections. - http://www.wiu.edu/library/govpubs/maps/
Glasgow University Library - Map Collection - General information, collection description, acquisitions lists, and links to map sites. - http://www.lib.gla.ac.uk/Depts/MOPS/Maps/
University of Melbourne Library - Map Section - Collection policy and guide, many scalable selected online index and historical maps, and map links. - http://www.lib.unimelb.edu.au/collections/maps/
Michigan State University - Map Library - General information, brief collection description, and large-scale PDF maps. - http://www.lib.msu.edu/coll/main/maps/maps.htm
National Library of Australia - Map Collection - Collection overview and description, online map images, and links to Australian mapping agencies and gazetteers. - http://www.nla.gov.au/map/
Western Association of Map Libraries - Independent association of map librarians. Membership information and publications. - http://www.waml.org/
Yale University - Map Collection - Collection descriptions and several online maps. - http://www.library.yale.edu/MapColl/index.html