64 Bulletin 7 lao 



Richardson, J. W., Cannel Coal from Virginia. 



Proc. Boston Soc. Nat. Hist., vol. vii, p. 32, 1859-61. 



Richmond & Danville Railroad Company. Catalogue of 

 the Minerals and Woods of the Regions of the States of 

 Virginia, North Carolina, South Carolina and Georgia. 

 Richmond, Va.,1889. ii & 34 pp. 



RigfgS, R. B., Analysis of "Natural Coke" from Midlothian, 

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Bull. U. S. Geol. Surv., No. 42, p. 146, 1887. 



Two Springs, One Mile from Farmwell Station, lyoudoun 



County, Virginia. Analyses. 



Bull. U. S. Geol. Surv., No. 42, p. 147, 1887. 



Trenton lyimestone from Lexington, Virginia. Analysis. 



Bull. U. S. Geol. Surv., No. 42, p. 137, 1887, 



Roanoke Times. Iron Ore, Roanoke County, Virginia. 

 Engr. and Min. Jour., vol. xxxv, p. 180, 1883. 



Robertson, R., Albite from Amelia County, Virginia. 

 The Virginias, vol. vi, p. 25, 1885. 



Robertson, Dr. W., On Virginia Tin. 



Min. Jour., October 18, 1884. [Not seen]. 



Robertson, Wyndham, Some Notes on the Holstein [Vir- 

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The Virginias, vol. iii, pp. 20-21, 42, 1882. 



Robinson, Samuel, A Catalogue of American Minerals with 

 Their Localities 



Boston, Mass., 1825. vi & 310 pp. 



Classified by State. 



For Virginia, see pp. 203-209. 



Rogers, H. D., Report on the Geology of North America. 

 Rep't British Assoc, vol. iv, pp. 1-66, 1834. 

 The Tertiary Paleontology referred to in more or less detail. 



An Inquiry into the Origin of the Appalachian Coal 



Strata, Bituminous and Anthracite. 



Trans. Assoc. Amer. Geol. and Nat., 1840-42, pp. 433- 

 474- 



On the Geological Age of the Coal Formation of Rich- 

 mond, Virginia. 



Proc. Acad. Nat. Sci. Phila., vol. i, p. 142, 1841-43. 



