88 Bulletin 7 144 



Salt. 



Min. Res. U. S., 1883-84, pp. 827-850. 

 For Virginia, see pp. 827, 840. 



Asbestos. 



Min. Res. U. S., 1883-84, pp. 913-914. 

 For Virginia,' see p. 913. 



— The Virginia Tin Mines. 



The Virginias, vol. vi, pp. 169-170, maps, 1885. 

 F'or further reference, see under Day, D. T. 



Williams, Geo. H., Anatase from the Arvon Slate Quarries, 

 Buckingham County, Virginia. 



Amer. Jour. Sci., 3d ser. , vol. xlii, pp. 431-432, 1891. 



The Petrography and Strudlure of the Piedmont Plateau 



in Maryland, with Supplement by C. R. Kej^es. 



Bull. Geol. Soc. Amer., vol. ii, pp. 301-322, map and 

 se(5lion, 1891. Discussion, pp. 317-318. 



Read before the Society, December 30, 1890. 



Geology of Crystalline Rocks. 



Wash. Sheet, D. C, Va., U. S. Geol. Surv. 



The Annual Expedition of the Students in Geology, 



1893. Announcement. 

 J. H. Univ. Cir., vol. xii, p. 54, 1893. 



The Distribution of Ancient Volcanic Rocks along the 



Eastern Border of North America. 



Jour. Geol., vol. ii, pp. 1-31, maps and figures, 1894. 

 For Virginia, see pp. 27-31. 



Williams, G. H., Willis, B., & Darton, N. H., Geology 

 of Washington and Vicinity. 



Congres Geologique International. Compte Rendu, 

 S^e Session, Washington, 1891, pp. 219-257, se(5lions. 

 For further reference, see under McGee, W J. 



Williams, H. S., Correlation Papers— Devonian and Carbon- 

 iferous. 



Bull. U. S. Geol. Surv., No. 80, 189 1. v & 279 pp. 

 For Virginia, see especially pp. 29, 86, 112, 113. 



William.S, Jonathan, Barometrical Measurement of the Blue 

 Ridge, Warm Springs, and Alleghany Mountains in Vir- 

 ginia, Taken in the Summer of the Year 1791. 



