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Microdem: http://www.nadn.navy.mil/Users/oceano/pguth/website/microdem.htm
OziExplorer: http://www.oziexplorer.com/
GIS Data
Depot: This is an excellent link for purchasing digitized Topo Maps and
Aerial maps. You can download 250Megs of maps for $24.95. (Maps average 5M in
size). They also have DEM's (Digitized Elevation Models) which can be
overlaid with Topo's to give a 3D effect to maps: http://data.geocomm.com/catalog/US/sublist.html
USGS
GNIS: Another excellent site. This is a query site for locating features on
Topo maps. Use this site for locating the exact maps I need for a
particular area. You can also get coordinates for a particular feature i.e.
school, Church, Park, ect. http://geonames.usgs.gov/pls/gnis/web_query.gnis_web_query_form
Here
is the link to the an Article Written
by Michael Long on digitizing scanned maps
with Microdem: http://www.nb.net/~resteele/newsites/microdem.htm
A
good site on Using Topo Maps: http://www.nb.net/~resteele/newsites/
Maryland
Geological Survey - They have a library upstairs which has old topo maps. They
will make copies of maps upon request: http://www.mgs.md.gov/
This link is to
MapTech. for
Century Maps. They are
free for download: http://historical.maptech.com/index.cfm
Terraserver
is a good link for getting printable sections of Topo maps. Can access Aerial
maps through USGS GNIS: http://terraserver.microsoft.com/

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