GYPSUM IN UTAH AND VIRGINIA. United States Geological Survey, Bulletin 530-N.
GPO, Washington DC, 1912. 9 x 6, wrappers, 37 pp, 1 plate (folding map), 5 figures, ex-lib, else vg. FIRST ED. More
GPO, Washington DC, 1912. 9 x 6, wrappers, 37 pp, 1 plate (folding map), 5 figures, ex-lib, else vg. FIRST ED. More