EARLE, JNTERHEDDED IRON ORE DEPOSITS 157 



23. Boyd, C. R. : The Mineral Wealth of Southwestern Virginia. Am. Inst. 



Mng. Engrs. Trans., Vol. V, pp. 81-92. 1877. 



24. : Idem. Am. Inst. Mug. Engrs. Trans., Vol. VIII, pp. 338-348. 



1880. 



25. : Resources of Southwest Virginia. New York, 1881. 



26. : The Economic (ieology of the Bristol and Big Stone Gap Sections 



of Tennessee and Virginia. Am. Inst. Mug. Engrs. Trans., Vol. XV, 

 pp. 114-141. 1887. 



27. : Middlesboro, Kentucky. Eng. and Mng. Jour., Vol. XLIX, pp. 



171-173. 1890. 



28. Bkainerd, a. F. : Notes on the Iron Ores, Fuels, etc., of Birmingham 



District. Am. Inst. Mng. Engrs. Trans., Vol. XVII, p. 151. 1888- 

 1889. 



29. Brewer, Wm. M. : Southern Iron Ore and Coal. Min. Ind., Vol. V, pp. 



350-3.51. 1896. 



30. : Red Hematite, Alabama and Georgia. Min. Ind., Vol. Ill, pp. 



634-635. 1894. 



31. Briggs, C, Jr.: Iron Ores (Clinton). Ohio Geol. Surv. Ann. Kept, pp. 



87-93. 1838. 



32. Burciiard, E. F. : Iron Ores in Brookwood Quadrangle, Alabama. U. S. 



Geol. Surv. Bull. 260. pp. .323-.330. 1905. 



33. : The Clinton or Red Ores of the Birmingham District, Alabama. 



U. S. Geol. Surv. Bull. 315, pp. 130-151. 1907. 



34. : The Clinton Iron Ore Deposits in Alabama. Am. Inst. Mng. 



Engrs. Trans., \'ol. XL, pp. 75-1.33. 1909. 



35. : An Estimate of the Available Tonnage of Clinton Iron Ore in 



the Birmingham District, Alabama. U. S. Geol. Surv. Bull. 340, p. 

 .308. 1908. 



36. : Tonnage Estimates of Clinton Iron Ore in the District of Chatta- 

 nooga, Tennessee, (Jeorgia and Alabama. U. S. Geol. Surv. Bull. 380, 

 pp. 169-187. 1908. 



37. , Butts, Chas., and Eckel, E. C. : Iron Ores, Fuels and Fluxes of 



the Birmingham District, Alabama. U. S. Geol. Surv. Bull. 400. 

 1909. 



38. : Prospecting for Bedded Hematite Iron Ore by Pits and Drills. 



Mng. and Eng. World, Dec. 28, 1912. (Advance chapter from Min. 

 Res., U. S. Geol. Surv. Abstract.) 



39. : The Red Iron Ores of East Tennessee. U. S. Geol. Surv. and 



Geol. Surv. of Tenn. Bull. 16. 191.3. 



40. Butts, Chas.: Iron Ores in the Montevallo-Columbiana Region, Alabama. 



U. S. Geol. Surv. Bull. 470, pp. 22.3-230. 1911. (Similar to Clinton 

 Ore.) 



41. : See Burchard. E. F., and Eckel, E. C. U. S. (Jeol. Surv. Bull. 



400. 1909. (37.) 



42. Callot, Tony : The Eorraine Deposits of Oolitic Iron Ore. Eng. and 



Mng. Jour., Vol. LXXXVII, pp. 1221-1226. 1909. 



43. Campbell, M. R. : Estillville Folio, Virginia-Kentucky-Tennessee. Geol. 



Atlas of U. S., U. S. Geol. Surv. Folio 12, p. 5. 1894, 



