145 Geological Bibliography of Virginia 89 



Trans. Amer. Phil. Soc, old ser. , vol. iv, pp. 216-223, 

 secftions, 1799. 



Also see note by Dr. Hewson, Proc. Amer. Phil. Soc, vol. i, pt. 

 i, p. 466, 1774-1S38. 



Willis, Bailey,? The Great Natural Tunnel on the South 

 Atlantic & Ohio Railroad, Virginia. 



Engr. and Min. Jour., vol. xlv, p. 19, 1888, photograph. 



The Mechanics of Appalachian Strucfture. 



13th Ann'l Rep't U. S. Geol. Surv., pp. 211-282, pis. 

 46-96, figs. 16-17, maps, 1891-92. 

 For Virginia, see pp. 225-230. 

 {Abst.) Amer. Geol., vol. xv, p. 60, 1895. 



The Northern Appalachians. 



The Physiography of the United States, pp. 169-202, 

 maps and figures. 



American Book Co., N. Y., 1896. 



Virginia more or less mentioned throughout article. 



For further references, see under McGee, W J, and Williams, G. H. 



Winslow, A., Tin Ore in Virginia. 



Engr. and Min. Jour., vol. xl. p. 320, 1885. 



The Virginia Tin Mines. 



For reference, see under Hotchkiss, Jed., for 1885. 



Wise, Frank N., The Copper Ores of Loudoun County, Vir- 

 ginia. 



The Virginias, vol. v, pp. 192, 1884. 



Wooldridge," A. S., Geological and Statistical Notice of the 

 Coal Mines in the Vicinity of Richmond, Virginia. 

 Amer. Jour. Sci., vol. xliii, p. 1-14, 1842. 



Woolman, I/., Artesian Wells and Water-bearing Horizons 

 of Southern New Jersey, (with a "Note on the Exten- 

 sion Southward of Diatomaceous Clays and the Occur- 

 rence there of Flowing Artesian Wells. 



Ann'l Rep't Geol. Surv. N. J., 1890, pp. 269-276. 



Wright, Carroll D., Abstradl of the nth Census U. S., 

 1890. Statistics of Mineral Industries, pp. 183-208. 

 Virginia references scattered throughout. 



Wurt^, Henry, Grahamite, West Virginia. 



Amer. Jour. Sci., 2d ser., vol. xlii, pp. 420-421, 1866. 

 Report upon a mineral formation in West Virginia. New York, 

 186.S. 



