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Maps

International

Google Earth
This 3D digital earth pioneer delivers a 3D digital model of the entire earth via the Internet. "Google Earth combines satellite imagery, maps and the power of Google Search to put the world's geographic information at your fingertips."

Google Maps
"Google Maps is a Google service offering powerful, user-friendly mapping technology and local business information-including business locations, contact information, and driving directions."  Find business locations, view satellite images, and navigate street-level images.

Green Map System
"From its beginning in 1995, the Green Map System was inspired by a desire to: help urban dwellers of all ages represent and share the ecological and cultural resources in their cities; promote good greening efforts underway in communities across the globe."

Map Collections 1500-2004
"The Geography and Map Division of the Library of Congress holds more than 4.5 million items, of which Map Collections represents only a small fraction, those that have been converted to digital form."

MapQuest
Get maps, driving directions, a road trip planner, or yellow pages information.

Perry-Castaneda Map Collection
"The Perry-Castañeda Library Map Collection (PCL 1.306) is a general collection of more than 250,000 maps covering all areas of the world." It is one of numerous digital projects of the University of Texas at Austin.

The World of Maps
"Maps, spatial data and GIS on the Internet - and how to find them. Links to catalogues of map holdings, map collections and map archives, map curatorship and map history, map institutions, map events and many others, from The Swiss Federal Institute of Technology."

United States

Color Landform Atlas of the United States "Each state link brings up a menu of links to maps and other online information about the state. There are two main types of links on each state page: maps and images local to this site, and links to external web sites."

National Atlas
"Work on a new National Atlas of the United States® began in 1997. This Atlas updates a large bound collection of paper maps that was published in 1970. Like its predecessor, this edition promotes greater national geographic awareness. It delivers easy to use, map-like views of America's natural and sociocultural landscapes. Unlike the previous Atlas, this version is largely digital" and is a project of the U.S. Dept. of the Interior.

TerraServer-USA
This site provides free access to aerial photos and maps of the United States, from USGS.

Topographic Map Collection
The National Map provides public access to high-quality, geospatial data and information from multiple partners to help inform decision making by resource managers and the public. The National Map is the product of a consortium of Federal, State, and local partners who provide geospatial data to enhance America's ability to access, integrate, and apply geospatial data at global, national, and local scales."

U.S.G.S. National Geologic Map Database
"The NGMDB is a collaborative effort primarily involving the USGS and the Association of American State Geologists."

Yahoo! Maps
Another source of maps and driving directions.

Pennsylvania

Pennsylvania Department of Conservation and Natural Resources
Maps for State Parks, State Forests, Rails-To-Trails, and links to other State online resources.

PennDOT/Bureau of Planning and Research
Maps of townships, boroughs, counties, railroads, and airports in PDF files are here for downloading.  Some files are historical.