Schencksville, Ballietsville, and the Lehigh river— 1875-6. By Frederick 

 Prime, J r. 8 vo., pp. 99, with 5 map-sheets and 5 plates. Price, $1 60 ; post- 

 age, $0 12. 



E. Special, Report on the Trap Dykes and Azoic Rocks of South- 

 eastern Pennsylvania, 1875 ; Part I, Historical Introduction. By T. Sterry 

 Hunt. 8 vo., pp. 253. Price, $0 48 ; postage, §0 12. 



F. Report of Progress in the Juniata District on Fossil Iron Ore 

 Beds of Middle Pennsylvania. By John H. Dewees. With a report of the 

 Aughwick Valley and East Broad Top District. By C. A. Ashbur- 

 ner. 1874-8. Illustrated with 7 Geological maps and 19 sections. 8 vo., pp. 

 305. Price, §2 55 ; postage, $0 20. 



G. Report of Progress in Bradford and Tioga Counties — 1874-8. I. 

 Limits of the Catskill and Chemung Formation. By Andrew Sher- 

 wood. II. Description of the Barclay, Blossburg, Fall Brook, Arsot, 

 Antrim, and Gaines Coal Fields, and at the Forks of Pine Creek in 

 Potter County. By Franklin Piatt. III. On the Coking of Bitumin- 

 ous Coal. By John Fulton. Illustrated with 2 colored Geological county 

 maps, 3 page plates and 35 cuts. 8 vo., pp. 271. Price, $1 00 ; postage $0 12. 



GG. Report of Progress. The Geology of Lycoming and Sullivan 

 Counties. I. Field Notes, by Andrew Sherwood. II. Coal Basins, by Frank- 

 lin Piatt. With two colored geological county maps and numerous illustra- 

 tions. 8 vo., pp. 268. Price, $1 06 ; postage, $0 14. 



GGG. Report of Progress in 1876-9. 8 vo., pp. 120. The Geology of 

 Potter County, by Andrew Sherwood. Report on the Coal Field, by 

 Franklin Piatt, with a colored geological map of county, and two page plates 

 of sections. Price, $0 53 ; postage, $0 08. 



H. Report of Progress in the Clearfield and Jefferson District 

 of the Bituminous Coal Fields of Western Pennsylvania — 1874. By 

 Franklin Piatt. 8vo., pp. 296, illustrated by 139 cuts, 8 maps, and 2 sections. 

 Price in paper, $1 50 ; postage, §0 13. Price in cloth, $1 75 ; postage, $0 15. 



HII. Report of Progress in the Cambria and Somerset District 

 of TnE Bituminous Coal Fields of Western Pennsylvania — 1875. By F. 

 and W. G. Piatt. Pp. 194, illustrated with 84 wood-cuts and 4 maps and sec- 

 tions. Part I. Cambria. Price, $1 00 ; postage, $0 12. 



HHH. Report of Progress in the Cambria and Somerset District 

 of the Bituminous Coal Fields of Western Pennsylvania — 1876. By F. 

 and W. G. Piatt. Pp. 34S, illustrated by 110 wood-cuts and 6 maps and sec- 

 tions. Part II. Somerset. Price, $0 85 ; postage, $0 18. 



IIHHH. Report of Progress in Indiana County — 1877. By W. G. 

 Piatt. Pp. 316. With a colored map of the county. Price, $0 80 ; postage, 

 10 14. 



H 5 . Report of Progress in Armstrong County— 1879. By W. G. Piatt. 

 Pp. 238. With a colored map of the county. Price, $0 75 ; postage, $0 16. 



I. Report of Progress in the Venango County District— 1874. By 

 John F. Carll. With observations on the Geology around Warren, by F. A. 

 Randall; and Notes on the Comparative Geology of North-eastern Ohio and 

 Northwestern Pennsylvania, and Western New York, by J. P. Lesley. 8 vo., 

 pp. 127, with 2 maps, a long section, and 7 cuts in the text. Price in paper. 

 §0 00; postage, $0 05. Price in cloth, $0 85; postage, $0 OS. 



II. Report of Progress, Oil Wells, Records, and Levels— 1876-7. 

 By John F. Carll. Pp. 398. Published in advance of Report of Progress, III. 

 Price, ?0 60; postage, $0 18. 



III. Report of Progress— 1875 to 1879. The Geology of the Oil Regions 



(2) 



