"Hubert Harrison: The Struggle for Equality, 1918-1927" (Columbia University Press) by Jeffrey B. Perry is now (in November 2020) being shipped by the Ingram Book Publishing Company.
Copies of the book can be ordered at 20% discount from Columbia University Press by using code "CUP20". Order it HERE
To order volume 1 – "Hubert Harrison: The Voice of Harlem Radicalism, 1883-1927" at 20% discount using code "CUP20" click HERE
For information on Hubert Harrison see HERE