I am not in the business of selling art. I simply know that Swann Auctions is a very reputable NYC business with everything being sold online these days Contact them directly.
Swann would likely be able to help you determine auction value for these works, or at least point you in the direction of the best market. The best first step is to make a quick list of artists and easy-to-find information you have at hand, and to share some snapshots with Swann's African American Art team via email. No worries if not everything falls under their speciality, they'll be able to share your list with colleagues at the house and let you know what items might be suitable for auction. Contact information can be found here: https://www.swanngalleries.com/departments/african-american-fine-art
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