308 
11. J. Spec. rcp. on the Petroleum of Pennsylv., by 
H. E. Wrigley; — 12. K. Rep. of progr. in the Greenl 
and Washington distr. of the bituminous coal-fields of 
Western Penns., by J. J. Stevenson; — 13. KK. Rep. 
of progr. in the Fayette andWestmoreland distr. of the 
bituminous coal-fields ol Western Penns., Part. I a. II, 
— 14. Rep. on the coal mines of the Monongahela river 
région, by J. Sutton Wall., part 1 : Descript. of the 
mines; 13. I. Spécial rep. on the coke manufacture 
on the Youghisgheny river valley in Fayette a. West¬ 
moreland counties, by Franklin Platt; — 16. M. Rep. 
of progress in the Laboratory of the Survey at Harris- 
bourg. 1874-75, bv A. S. Mac Creath. MM. — Second 
Rep. 1876-78; M. 3 th Rep., 1879-80; — 17. Rep. of 
progr. N. Two Hundred Tables of élévation above 
Tide-Level of the railroad station, sunnnits and tunnels, 
etc., in and arouad Pennsylv., by Ch. Allen; — 18. Ca¬ 
talogue of the geolog. Muséum, by Ch.-F. Hall, lait. 
I a n ( j H; __ 19.' p. Coal flora of Pennsylv., by L. Les- 
(iuereux, vol. I-III ; — P. Atlas to the coal floia of 
Pennsylv., by L. Lesq.; - 20. PP. The Permian or 
Upper Carboniferous flora of West Yirgima and S. W. 
Pennsylv., by W. M. M. Fontaine a. J. C. W hite, 
21. PPP. Ceratiocaridæ from the Upper devonian me¬ 
sures in Warren county, by Chas. E. Beecher; Eurvpte- 
ridæ fr. the Lower product, coal measures in Bæver 
county, by J. Hall; — 22. L. Rep. of prog. in the 
Beaver River distr. of the bituminous coal-fields of 
Western Pennsylv., by J. C. White; — 23. UQ- Lie 
geology of Lawrence county, by J. C. White; — 
24. OQQ. The geology of Mercer county, by J. C. 
White * — 25. OOOO'. The geology of Erie and Craw- 
ford counties, by L C. White; - 26. R. The geology 
of Mac Kean county, etc., by Chas. A. Ashburner. 
R. Maps and Charts; — 27. RR. part. IL The town- 
ship geolog) of Elk, Forest and Cameron counties, 
bv Ch. A.’ Ashburner and A. W. Sheafer. RR. Maps 
and Charts; — 28. T. The geology of Blair county, 
with Atlas, by Franklin Platt; — 29. T 2 . The geology 
of Bedford and Fulton counties, by J. J. Stevenson ; — 
30. T 3 . Geology of Huntingdon county, by J. G. White, 
etc.; — 31. TL Geology of Centre county, b) E. V. 
dTnvilliers ; — 32. Y. Part, first. The northern towns- 
pips of Butler county. Part. 2 d . A spécial survey made 
