Sign: c. 2009
Thousands of images!
Each "image" has been assigned its accession number. Documents, maps, books, etc. consisting of more than one page use the same accession number, but pages following the first are labeled A, B, C, etc. The first accession number is 10000.
Once it is open, just hold down the "ctrl" key and the "f" key to perform your search.
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Map: post offices and railroads c. 1908