of Warren, Venango, Clarion, and Butler Counties, including sur- 

 veys of the Garland and Panama Conglomerates in Warren and Craw lord, and 

 in Chautauqua county. New York. Descriptions of oil well rig and tools, and 

 a discussion of the preglacial and postglacial drainage of the Lake Erie country. 

 By John F. Carll. Pp. 482 ; with two indexes, 23 page plates, and an atlas of 

 22 sheets of maps, well sections, and working drawings of well rig and tools. 

 Price of report, §0 60 ; postage, $0 19. Price of atlas, $1 70 ; postage, fO 12. 



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 Slippery Rock Creek, by J. P. Lesley. 8 vo., 

 pp. 122 ; 5 maps and sections, opiate and 5 cuts. Price in paper, §0 75 : post- 

 age, 30 00. Price in cloth, SI 00 ; postage, §0 08. 



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

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

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

 beneath the surface at numerous points. Price in paper, §0 6i> ; postage, 30 16. 

 Price in cloth, 30 90 ; postage, 30 IS. 



KK. Report of Progress in the Fayette and Westmoreland Dis- 

 trict of the Bituminous Coal Fields of Western Pennsylvania — 

 1876. By J. J. Stevenson ; pp. 437, illustrated by 50 wood-cuts and 3 county 

 maps, colored. Part I. Eastern Allegheny County, and Fayette and West- 

 moreland Counties, west from Chestnut Ridge. Price, 31 40 ; postage, 30 20. 



KKK. Report of Progress in the Fayette and Westmoreland 

 District of the Bituminous Coal Fields of Western Pennsylvania — 1877. 

 By J. J. Stevenson. Pp.331. Part II. The Ligonier Valley. Illustrated 

 with 107 wood-cuts, 2 plates, and 2 county maps, colored. Price, 31 40; post- 

 age, 30 16. 



L. 1875— Special Report on the Coke Manufacture of the Yough- 

 iogheny River Valley in Fayette and Westmoreland Counties, 

 with Geological Notes of the Coal and Iron Ore Beds, from Surveys, by Charles 

 A. Young; by Franklin Piatt. To which are appended : I. A Report on 

 Methods of Coking, by John Fulton. II. A Report on the use of Natural Gas 

 in the Iron Manufacture, by John B. Pearse, Franklin Piatt, and Professor 

 Sadtler. Pp. 252. Price, 31 00; postage, SO 12. 



M. Report of Progress in the Laboratory of the Survey at 

 Harrisburg — 1874-5, by Andrew S. McCreath. 8 vo., pp. 105. Price in pa- 

 per, SO 50 : postage, 30 05. Price in cloth, ?0 75 ; postage, SO 08. 



MM. Second Report of Progress in the Laboratory of the Sur- 

 vey at Harrisburg, by Andrew S. McCreath — 1876-8, including I. Classifica- 

 tion of Coals, by Persifor Frazer. II. Firebrick Tests, by Franklin Piatt. 

 HI. Notes on Dolomitic Limestones, by J. P. Lesley. IV. Utilization of An- 

 thracite Slack, by Franklin Piatt. V. Determination of Carbon in Iron or 

 Steel, by A. S. McCreath. With 3 indexes, plate, and 4 page plates. Pp. 43S. 

 Price in cloth, SO 65 ; postage, 30 18. 



N. Report of Progress— 1875-6-7. Two hundred Tables of Elevation 

 above tide level of the Railroad Stations, Summits and Tunnels ; Canal Locks 

 and Dams, River Riffles, &c, in and around Pennsylvania : witli map; pp. 279. 

 By Charles Allen. Price, 30 70; postage, $0 15. 



O. Catalogue of the Geological Musuem — 1874-5-6-7. By Charles E. 

 Hall. Part I. Collection of Rock Specimens. Nos. 1 to 4,264. Pp.217. Price, 

 |0 40 ; postage, $0 10. 



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