1853 Map of all the railroads in the United States in operation and progress, by David McLellan, American Rail Road Journal, from the Digital Commonwealth - commonwealth cj82kp03g. (<a rel="nofollow" class="external free" href="https://www.digitalcommonwealth.org/search/commonwealth:cj82kp03g">https://www.digitalcommonwealth.org/search/commonwealth:cj82kp03g</a>)
David McLellan, American Rail Road Journal
Digital Commonwealth