Cite This Item
MLA
NHGIS. National Historical Geographic Information System. 18 Oct 2022. Web. 18 Jun 2025. <https://ark-dc3dev.bpl.org/ark:/50959/sx61f792t>.
APA
NHGIS. (2022, October 18). National Historical Geographic Information System [Data set]. Retrieved from https://ark-dc3dev.bpl.org/ark:/50959/sx61f792t
Chicago
NHGIS. "National Historical Geographic Information System." Data set. October 18, 2022. Digital Commonwealth, https://ark-dc3dev.bpl.org/ark:/50959/sx61f792t (accessed June 18, 2025).
Wikipedia
{{cite web | title=National Historical Geographic Information System | website=DigitalCommonwealth.org | date=October 18, 2022 | url=https://ark-dc3dev.bpl.org/ark:/50959/sx61f792t | accessdate=June 18, 2025}}