This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Frederick and Pennsylvania Line railroad from map. Uploaded with en wp UW marker historical scientific and statistical together with maps of the United States and Territories By Martenet Walling and Gray civil and topographical engineers Published by Stedman Brown Lyon Baltimore on verso Entered by Walling and Gray and Simon