You gave information but not enough if you can give me more information. But your site is great.
Beauford DelaneySue Canterbury
In reviewing your listing of books that include Delaney, I note that the following is missing:
Author: Peter Hastins Falk
Title: The Annual & biennial Exhibition Record of the Whitney Museum of Art 1918-1989.
Pub: Sound View Press, 1991
Delaney is listed on page 140 as having exhibited there in 1950.