From the Bain News Service collection, Library of Congress: https://www.loc.gov/pictures/item/ggb2004008329/

LoC description follows:

Title: National Negro Business League Executive Committee Creator(s): Bain News Service, publisher Date Created/Published: [no date recorded on caption card] Medium: 1 negative : glass ; 5 x 7 in. or smaller. Reproduction Number: LC-DIG-ggbain-08329 (digital file from original neg.) Rights Advisory: No known restrictions on publication. Call Number: LC-B2- 2053-15 [P&P] Repository: Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA http://hdl.loc.gov/loc.pnp/pp.print Notes: Forms part of: George Grantham Bain Collection (Library of Congress). Title from unverified data provided by the Bain News Service on the negatives or caption cards. General information about the Bain Collection is available at http://hdl.loc.gov/loc.pnp/pp.ggbain Format: Glass negatives.