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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map showing the comparitive area of the Northern and Southern States, east of the Rocky Mountains, 1861" The New York Public Library Digital Collections. 1861. https://digitalcollections.nypl.org/items/01dc9ca0-8bd7-0133-588b-00505686d14e
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map showing the comparitive area of the Northern and Southern States, east of the Rocky Mountains, 1861" New York Public Library Digital Collections. Accessed February 17, 2025. https://digitalcollections.nypl.org/items/01dc9ca0-8bd7-0133-588b-00505686d14e
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1861). Map showing the comparitive area of the Northern and Southern States, east of the Rocky Mountains, 1861 Retrieved from https://digitalcollections.nypl.org/items/01dc9ca0-8bd7-0133-588b-00505686d14e
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/01dc9ca0-8bd7-0133-588b-00505686d14e | title=
(cartographic)
Map showing the comparitive area of the Northern and Southern States, east of the Rocky Mountains, 1861, (1861)
|author=Digital Collections, The New York Public Library |accessdate=February 17, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>