DD. The Brown Hematitk Deposits of the Silubo-Cambrian Lime- 

 stones OF JjEuiGH County, lying between Shimersville, Millerstown, 

 Schencksville, Bailietsville, and the Leliigh river— 1875-6. By Frederick 

 Prime, Jr. 8 vc, pp. 99, with 5 viap-sheets and 5 plates. Price, §1 60 ; post- 

 age, SO 12. 



E. Special Kepokt 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. 



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

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

 AuGiiwicK 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. 



Gr, Report OF Progress IN Bradford AND Tioga Counties — 1874-8. I. 

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

 wood. II. Descrijition of the Barclay^ Blossburg, Fall Brook, Arnot, 

 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 witli 2 colored Geological county 

 maps, 'i plates and ^b cuts. 8 vo., pp. 271. Price, ?1 00; postage §0 12. 



H. Report of Progress in the Clearfield and Jefferson District 

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

 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. 



HH. Report of Progress in the Cambria and Somerset District 

 OF THE 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. 348, illustrated by 110 wood-cuts and 6 maps and sec- 

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



HHHH. Report of Progress in Indiana County — 1877. By W. Q. 

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

 fO 14. 



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 aSTorth-eiistern Ohio and 

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

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

 f 60 ; postage, $0 05. Price in cloth, $0 85 ; postage, $0 08. 



II. Report of Progress, Oil Well 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. 



J, Special Report on the Petroleum of Pennsylvania — 1874, its 

 Production, Transportation, Manufacture, and Statistics. By Henry E. Wrig- 

 ley . To which are added a Map and Profile of a line of levels through Butler, 

 Armstrong, and Clarion Counties, by D. Jones Lucas: and also a Map and 

 Profile of a line of levels along Slipper}' Rock Creelc, bj^ J. P. Lesley. 8 vo., 

 pp. 122; 5 maps and sections, a. plate and 5 cuts. Price in paper, |0 75 ; post- 

 age, |10 06. Price in cloth, ?1 00 ; postage, ^0 OS. 



K. Report on Greene and Washington Counties — 1875, Bituminous 

 Coal Fields. By J. J. Stevenson, 8 vo., pp.420, illustrated by 3 sectioris and 2 

 county maps, showing the depth of the Pittsburg and Waynesburg coal bed, 



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