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Perry, John B. 



AVr Cliarles T. Jackson. 

 Phillips, J. V. 



The Geology of the Upper Mississippi Lead Region. Mining Mag., New York, 

 1854, ii. 129-138. 

 Piggot, A. Snowden. 



On Copper and Copper Mining. Pliiladelphia, 1858, 388 pp.; Mining Mag., 

 1858, X. 124-142, entitled History of the Copper Kcgion of Lake Supe- 

 rior. 

 Porter, George F. 



lleport on the Copper Rock. George P. Porter in Thomas L. McKenucy's 

 Tour to the Lakes, Baltimore, 1827, pp. 477, 478. 

 Posselt, C. 



Die Kupfer-Distrikte des Obersee's, Lake Superior. Leonhard's Jahrbuch, 

 1S5G, pp. 1 - 10. 

 Preston, Samuel. 



Copi)er Ore on Lake Superior. Niles's Weekly Register, 1829, (3,) xii. 203. 



Pumpelly, Raphael. 



The Paragenesis and Derivation of Copper and its Associates on Lake Supe- 

 rior. Am. Jour. Sci., 1872, (3,) iii. 188 - 198, 243 - 258, 347- 353 ; Leon- 

 hard's Jahrbuch, 1872, pp. 538-540; Geol. of Michigan, Part IL, 1873. 



On Pseudomorphs of Chlorite after Garnet at Spurr Mountain Iron Mine. 

 Am. Jour. Sci., 1875, (3,) x. 17-21. 



Metasomatic Development of tlie Copper-bearing Rocks of Lake Superior. 

 Proc. Am. Acad., 1878, xiii. 253-309. 



See T. B. Brooks and T. C. Chamberlain. 



Rath, Gustav vom. 



Leber Kaikspath vom Oberen See. Pogg. Ann., 1SG7, cxxxii. 3S7-404; 

 Leonliard's Jahrbuch, 18G8, pp. 347, 348. 

 Rawson, A. L. 



Pictured Rocks of Lake Superior. Harper's New Monthly Mag., 1867, 

 xxxiv. 681. 

 Relfe, James H. 



Sale of Mineral Lands. Reports of Committees, 1845-46, 1st Sess. 29th 

 Cong., iii., No. 591, 51 pp. with map. Contains part of Douglass 

 Houghton's Fourth Report, and some Analyses by Charles T. Jackson. 

 Richardson, John. 



On some Points of the Physical Geography of North America in Connection 

 with its Geological Structure. Quart. Jour. Geol. Soc, 1851, vii. 212- 

 215. 

 Rivot, L. E. 



Memoire sur le Giscment du Cuivre Natif au Lac Superieur. Comptes Ren- 



dus, 1855, xl. 1306-1309. 

 Voyage au Lac Superieur. Annales des Mines, 1855, (5,) vii. 173-328; 



