United States. Bureau of Foreign and Domestic Commerce and United States. Bureau of the Census. "1881, Fourth Number," Statistical Abstract of the United States (1881). https://fraser.stlouisfed.org/title/66/item/22010, accessed on April 24, 2024.
United States. Bureau of Foreign and Domestic Commerce and United States. Bureau of the Census. "1881, Fourth Number," Statistical Abstract of the United States (1881). https://fraser.stlouisfed.org/title/66/item/22010, accessed on April 24, 2024.