United States. Bureau of the Census. "Introduction" in Statistical Atlas of the United States, 1920 (1925). https://fraser.stlouisfed.org/title/5191/item/527615, accessed on April 19, 2024.
United States. Bureau of the Census. "Introduction" in Statistical Atlas of the United States, 1920 (1925). https://fraser.stlouisfed.org/title/5191/item/527615, accessed on April 19, 2024.