Below are two messages with several possible sites.
Moderator

-----Message 1-----------------------------------------------

Elisabeth,

Here are three sites with clickable, interactive USGS maps:
http://TopoZone.com/
http://navigator2.maptech.com/homepage/index.cfm?
http://www.trails.com/explore/maps.asp

Perhaps it is a help.

Regards,

Roelof Oddens
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Roelof P. Oddens
Map Collection, Faculteit Ruimtelijke Wetenschappen, Universiteit Utrecht
P.O. Box 80.115
3508 TC  Utrecht, The Netherlands
tel. +31 30 253 4401
[log in to unmask]
Visit Oddens' Bookmarks (database with 12,500+ cartography links):
http://oddens.geog.uu.nl/
Homepage Map Collection:
http://kaartenzaal.geog.uu.nl/

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxx

-----Message 2----------------------------------------------------

Beth,

I think, your professor is talking about National Atlas
(http://www.nationalatlas.gov/).
This site was developed by the U.S. Geological Survey and its partners.

Thanks.
-Wangyal
Tsering Wangyal Shawa
Geographic Information Systems Librarian
Digital Map and Geospatial Information Center
Geosciences and Map Library
Guyot Hall, Princeton University
Princeton, NJ 08544
Phone: (609) 258-6804
Fax: (609) 258-4607
www.princeton.edu/~geolib/gis

>--- Begin Forwarded Message ---
>Date: Thu, 8 Feb 2001 17:08:55 -0700
>From: Elisabeth Filar <[log in to unmask]>
>Subject: USGS online map
>Sender: Elisabeth Filar <[log in to unmask]>
>
>
>
>
>
>I have a professor that has asked me about an online map of the USA on the
>USGS site. It showed the topographic features map and switched to a geologic
>features map. Any one know what I am talking about? You know how hard it is
>to find something on the USGS site, I was hoping to find someone that could
>point me to the right direction.
>
>Thanks in advance!
>Beth
>
>~.~.~.~.~.~.~.~.~.~.~.~.~.~.~
>Elisabeth Filar * Map Librarian
>University of Colorado at Boulder
>phone: 303-735-4917 * fax:303-735-4879
>http://www-libraries.colorado.edu/ps/map/frontpage.htm
>~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~
>
>--- End Forwarded Message ---
>