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Historical Map Collections
The David Rumsey Collection
The map collection at the Library of Congress
The Perry-Castaņeda Map Collection from the University of Texas
The Norman Leventhal Map Collection, at the Boston Public Library
Victorian-era maps of London from the Victorian Dictionary

Useful Online Maps and Map Aggregators
Downloadable topo maps for the entire U.S., from the USGS
Lots of great map links from the University of Minnesota
And LOTS of other links from