beneath the surface at numerous points. Price in paper, ?0 Go ; postage, $0 16. 

 Price in cloth, §0 90 ; postage, §0 18. 



KK. REPOKT of PllOGRESS IX THE FaYETTE AND WESTMORELAND DlS- 

 TKICT OF THE BITUMINOUS COAL. FIELDS OF WESTERN PENNSYLVANIA 



187G. By J. J. Stevenson ; pp. 437, illustrated by uO wood-cuts and 3 county 

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

 moreland Counties, west from Chestnut Ridge. Price, 51 40 ; jxjstage, $0 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 11. The Ligonier Valley. Illustrated 

 with 107 wood-cuts, 2 plates, and 2 county majjs, colored. Price, §1 40; post- 

 age, SO IG. 



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

 iogheny River Valley in Fayette and Westmoreland Counties, 

 with Geologiciil Notes of the Coal and Iron Ore Beds, from Surve3s, by Charles 

 A. Young; by J-'ranldin Platt. To which are appended: I. A Report on 

 JNIethods of Coking, by John Fulton. II. A Report on the use of Natural Gaa 

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

 Sadtler. Pp. 252. Price, SI 00 ; postage, §0 12. 



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

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

 per, §0 50; postage, gO 05. Price in cloth, 50 75 ; postage, 50 OS. 



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

 vey at Uarrisburg, by Andrew S. McCreath — 187G-8, including I. Classilica- 

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

 III. Notes on Dolomitio Limestones, by J. P. Lesley. IV. Utilization of An- 

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

 Steel, by A. S. JSIcCreath. With 3 indexes, plate, and 4 page plates. Pp. 438. 

 Price in cloth, §0 C5 ; postage, 50 18. 



N. Report of Progress— 1S75-G-7. Two hundred Tables of Elevation 

 above tide level of the Railroad Stations, Summits and Tunnels ; Canal I^ocks 

 and Dams, River Riffles, etc., in and around Pennsylvania; with rn«;> ; pp. 279. 

 By Charles Allen. Price, 50 70 ; postage, 50 15. 



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

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

 fO 40 ; postage, 50 10. 



P. 1879 — Atlas of the Coal Flora of Pennsylvania and of the 

 Carboniferous Formation throughout the United States. 87 plates 

 with explanations. By Leo Lesquereux. Price, 53 35; postage, 50 22. 



Q. Report of Progress in the Beaver River District of the Bitu- 

 minous Coal Fields of Western Pennsylvania. By I. C. White; pp. 

 337, illustrated with 3 Geological maps of parts of Beaver, Butler, and Alle- 

 gheny Counties, and 21 plates of vertical sections— 1^5. Price, 51 40; post- 

 age, 50 20. 



QQ. Report of Progress in 1877. The Geology of Lawrence County, 

 to which is appended a Special Report on the Correlation of the Coal 

 Measures in Western Pennsylvania and Eastern Ohio. 8 vo., pp. 336, with 

 a colored GeoloQical Map of the county, and 134 vertical sections. By I. C. 

 White. Price, 50 70 ; postage, 50 15. 



V. Report of Progress— 1878. Part I. The Northern Townships of But- 

 ler county. Part II. A special survey made in 1875, along the Beaver and 

 Shenango rivers, in Beaver, Lawrence and Mercer Counties. 8 vo., pp. 24S, 

 with 4 majys, 1 profile section and 154 vertical sections. By 11. :Martyn 

 Chance. Price, 50 70 ; postage, 50 15. 



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