Troy: Southworth, 1920. hardcover. VOLUMES II AND III ONLY. 8 diagnostic cards and 79 stereograms, loose as issued. 8vo, cloth portfolios with ties in dark blue cloth slipcases; portfolios have some minor soiling to the spines, slipcases are lightly worn but sound. Troy: The Southworth Company, (1920). A very good set. very good.