Maps from the University of Texas  Very large digital collection of political, physical and special maps.  Also includes maps of areas of current interest.
CIA World Factbook Political maps, flags, country profiles
Atlapedia.com  Annoying ads but does have very good relief maps.  Also has political maps.
GIS Maps
Google Maps
Mapquest.com  Maps, driving directions and time
Natural Resource maps  From the University of Texas.  Select your country and scroll down to CIA Atlas or economic activities, vegetation, physical features etc.
National Geographic Maps  Interactive thematic, outline and political maps as well as country profiles, flag, exports, agriculture, economy, link to CIA Factbook
National Geographic Atlas REF 912 NAT  There are several pages in this book located in the atlas case in the library that include minerals, energy, grains, fish, cattle, sheet, economy etc.
UN Maps
Pennsylvania Maps From the PA Dept of Transportation - current and historic county maps, metropolitan maps, Mileage charts, time  & mileage charts, airport maps
Pennsylvania Maps From the PA Dept of Transportation - Spatial maps, printed maps to order, interactive traffic volume map etc.

USGS Maps
     US Geological Survey maps  Maps, lesson plans, maps, educational resources, maps, did I mention maps?
     Atlas of USGS.gov  Government site that lets you build a detailed map of United States resources, population and other characteristics.

Historical maps
     Historical maps of Pennsylvania (Paper)  Very fragile
     Historical maps from the University of Texas
     David Rumsey Historical Map Collection  Historical maps of the world with concentrations on     rare 18th and 19th century maps of North and South America.
     Online Historical Maps  There is a charge for photocopies of these maps

Union County and Susquehanna Valley
Pa County USGS maps from USGenWeb

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