HISTORIC AMERICAN LANDSCAPES SURVEY National Park Service
U.S. Department of the Interior report.
https://www.loc.gov/item/va2213/
https://tile.loc.gov/storage-services/master/pnp/habshaer/va/va2200/va2213/data/va2213data.pdf
A consortium of African American investors bought Yellow Sulphur Springs in 1926 and entertained African American guests. These men were closely associated with Henry Street businesses in Roanoke, according to this report. The adventure was short-lived as it was sold in 1929.
Maps of the Springs in reference with Blacksburg and Christiansburg. USGS Historic Maps
Gathering African American History 