1885年,约翰·洛根少将( John A. Logan)购买了艾奥瓦环岛和西北区P街上的“斯通大厦”。三届总统候选人威廉·布赖恩(William J.Bryan)后来从洛根(Logans)租借了这座建筑。 [10]国会在1930年12月以洛根(Logan)的名字将环岛的名称更改为“洛根圆环”。 [11]杜邦圆环市民协会(Dupont Circle Citizens Association)成立于1922年,位于P街1767号的一栋联排别墅中。 [12]
^Hagner, Alexander. "Street Nomenclature of Washington City." Records of the Columbia Historical Society. 7 (1904), pp. 237-261, 240.
^Hagner, Alexander. "Street Nomenclature of Washington City." Records of the Columbia Historical Society. 7 (1904), pp. 237-261, 257.
^Hawkins, Don Alexander. "The Landscape of the Federal City: A 1792 Walking Tour." Washington History. 3:1 (Spring/Summer 1991), p. 10-33, 16.
^Hawkins, Don Alexander. "The Landscape of the Federal City: A 1792 Walking Tour." Washington History. 3:1 (Spring/Summer 1991), p. 10-33, 17.
^The "run", or creek, got its name from "slashes", or stands, or silver maples which stood near its headwaters. See: Hawkins, Don Alexander. "The Landscape of the Federal City: A 1792 Walking Tour." Washington History. 3:1 (Spring/Summer 1991), p. 10-33, 21.
^Brown, Letitia. "Residence Patterns of Negroes in the District of Columbia, 1800-1860." Records of the Columbia Historical Society. 69/70 (1969/1970), pp. 66-79, 74.
^Half of all property in this area was owned by African Americans. See: Brown, Letitia. "Residence Patterns of Negroes in the District of Columbia, 1800-1860." Records of the Columbia Historical Society. 69/70 (1969/1970), pp. 66-79, 76.
^McArdle, Walter F. "The Development of the Business Sector in Washington, D. C., 1800-1973." Records of the Columbia Historical Society. 49 (1973/1974), p. 556-594, 567.