(I 3.) Atlas of 22 sheets. Map of Venango county, colored geologically; 

 map <>!' lower oilfield (Butler, Armstrong and Clarion) in 2 sheets; 3 local 

 contour maps at Franklin, Titusville, and Spring creek; two maps of N. W. 

 Pennsylvania showing the past and present drainage ; long section across W. 

 Pennsylvania; vertical section of the formations from the Upper Coal. Meas- 

 ures down to the bottom of the Devonian ; diagram map and section of Third 

 Hand : profile section from Meadville, S. W.; 5 sheets of grouped oil well sec- 

 tions; 5 sheets of working drawings for well boring, (fee; diagram of daily 

 rate of drilling six wells at Petrolia. (Sold only with the report.) 



I 4. Report on Warren county, by J. F. Carll. With a colored geological 

 county map, a map of the Warren oil region, and 2 sheets of oil well sections. 

 8°, pp. 439, 1883. Price $1 12, postage $0 20. (Note. The first 147 pages of 

 this book contain oil well records ; see under Petroleum Fields below.) 



J. Report on the Oil Region, by H. E. Wrigley ; map and profile of line 

 of levels through Butler, Armstrong, and Clarion, by D. J. Lucas ; map and 

 profile of Slippery Rock creek, by J. P. Lesley. 5 maps and sections, a plate 

 and 5 cuts. 8°, pp. 122, 1875. Price in paper $0 75, postage $0 06. 



K. Report on Greene and Washington counties, by J. J. Stevenson. 

 With two county maps. (Showing the calculated local depths of the Pitts- 

 burg and Waynesburg coal beds beneath the surface,) and 3 page plates of 

 general sections. 8°, pp. 419, 1876. Price, in paper, $0 65, postage 50 16. 

 (Note. — Since the publication of this book, two colored geological county 

 maps have been published, and will be found in pocket of volume K3 de- 

 scribed below.) 



K 2. First report on Fayette, Westmoreland, and S. E. Allegheny 

 counties, (i. e. west of Chestnut ridge,) by J. J. Stevenson. With 3 colored 

 geological county maps, and 50 cuts in the text. 8°, pp. 437, 1877. Price f 1 40, 

 postage ?0 20. 



K 3. Second report on Fayette and Westmoreland counties, (the Lig- 

 onier valley,) by J. J. Stevenson. With 4 page plates, and 107 cuts in text. 

 8°, pp. 331, 1878. Price $1 40, postage $0 16. (Note.— In a pocket in this vol- 

 ume will be found the colored geological maps of Greene and Washington 

 counties, alluded to above.) 



K 4. Pt. I, Report on the Mononoahela river coal mines, from the West 

 Virginia State line to Pittsburgh, (Including some on the Youghiogheny and 

 other streams,) by J. Sutton Wall. With a map of the region in a pocket, 12 

 heliotype pictures, and 26 page plates. 8°, pp. 231, 1884. Price $1 15, j ostage 

 *0 14. 



1L. Report on the Youghiogheny coke manufacture, by F. Piatt ; Notes 

 on the coal and iron ore beds, by C. A. Young ; Report on methods of coking, 

 by J. Fulton, (Sec O below;) Report on the use of natural gas in the iron 

 manufacture, by J. B. Pearse and F. Piatt ; The Boyd's hill gas well at Pitts- 

 burg, by J. P. Lesley. With a map of the coke region, two folded plates of 

 coke ovens, and page plates and cuts in the text. 8°, pp. 252, 1876. Price 

 $1 00, postage $0 13. 



<l. Report on Bk.wkk, N. W. Alleghany, and S. BUTLBB counties, by 

 1. ('. While With 8 colored geological oounty maps, and 21 page plates of 

 sections. 8°, pp. 337, 1878. Price $ 1 1". postage $0 20. 



Q. 2. Report on L.wvkkm'k county, and special Report on Correlation of 

 the Pennsylvania and I >bto ooal beds, by I. C. White, With a colored geolog- 

 ical oounty map, and L84 cuts in the text. SO, pp. 336, 1879. Price $0 70, post- 

 ago ?0 15. 



