This is Irwin's Master Thesis submitted to the University of Virginia Academic Faculty in 1929. It can certainly be read as a manifestation of the racism, or - if you prefer - the gross insensitivity of the time. But there is information on the topic as well.
Charlottesville: The University of Virginia, 1929. 94 pages with four tables, photos, a fold-out map, and an appendix. Trade paperback.