[[https://www.loc.gov/resource/g3843h.la000296/|Martenet's Map of Howard County]]
[[https://jscholarship.library.jhu.edu/handle/1774.2/32620|Atlas of Fifteen Miles Around Baltimore Including Howard Co, Maryland]]
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The new war map of Maryland, part of Virginia & Pennsylvania Mayer & Co's., lith., Boston.
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Map and Profiles Showing the Baltimore and Ohio Rail Road...Hunckel and Sons, 1858