county map here is from the Dennis Griffith map of
Maryland in the Library of Congress Map Collection...
it's an amazing and beautiful piece of workmanship for
inline maps on each page are JPEGs approximately 250K in
size. There is also a link to a second version of the
same map. This second map is bigger when printed out and
has also been only slightly compressed.
probably a good idea to use your browser's "Download Link
to Disk" command on this second link as these files are
1-2MB in size.