Sinkankas, John; Gemstones of North America, in Two Volumes. Volumes one and two, Van Nostrand Reinhold, 1976. Quarto, vol. 1, pp. xv, 675, 176 illustrations (some full page and colored). Vol. 2, pp. xvi, 494, 110 illustrations, 16 colored plates.
The set is complete and in the original green cloth (vol. 1) and wine colored cloth (vol. 2) with gilt spine titles and colored dust jackets. Minor edge wear to dust jackets, otherwise a fine set.