found: The Negro and the nation, 1917:t.p. (Hubert H. Harrison)
found: Perry, Jeffrey B. Hubert Henry Harrison, "the father of Harlem radicalism", 1986.
found: LC data base, June 22, 1989(hdg.: Harrison, Hubert H.)
found: OCLC data base, December 2, 1991(hdg.: Harrison, Hubert Henry, 1883-1927)
found: Universal Negro Improvement Association Philadelphia Division records, 1919-1920:(Hubert Henry Harrison (Apr. 27, 1883, Estate Concordia, St. Croix, Danish West Indies (now U.S. Virgin Islands) - Dec. 17, 1927, New York, NY) was a West Indian-American writer, orator, educator, critic, and radical socialist political activist based in Harlem, New York)
found: English Wikipedia, viewed July 9, 2021(Hubert Harrison; Hubert Henry Harrison; born April 27, 1883, in St. Croix, Danish West Indies (now U.S. Virgin Islands); died December 17, 1927, in New York; West Indian-American writer, orator, educator, critic, race- and class-conscious political activist, and radical internationalist based in Harlem, New York)