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I have offered the duplicates I have of the USGS Illinois flood prone
area maps to Illinois map libraries, but I still have some quads left.
These are the black and white topo based maps done back in the 1970's
predating the FEMA rate maps. There isn't a complete set left but some
quads still have multiple copies. So the first respondants with
mailing address will receive absolutely free a single copy of each
quad left until they run out. I can also include an unmarked index map
so that you can mark what you will own.