Your colleague Pat Gale provided copy from the AIC catalog on Bisa Butler’s work currently on display in Rituals of Resistance:

Bisa Butler notes from Catalog

And your colleague Sue Hamburge found a link to the actual photograph on which the quilt is based:

Four African American women seated on steps of building at Atlanta University, Georgia]
Askew, Thomas E., 1850?-1914, photographer
Du Bois, W. E. B. (William Edward Burghardt), 1868-1963, collector

and a link to the jpeg: photograph