At head of title: Supplement to the New York observer. Issued in parts; maps dated 1841-1845. National Endowment for the Humanities Grant for Access to Early Maps of the Middle Atlantic Seaboard. Prime meridians: Greenwich and Washington. Relief shown by hachures. Shows county boundaries. Includes the profiles of Baltimore and Ohio Rail Road, and, Chesapeake and Ohio Canal. Inset: District of Columbia.; Maryland and Delaware.

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