Geology — Serials. 
91 
Harrisburg [Penn.] Geol. Survey of Pennsylvania—continued. 
G 3 . Potter County, 1880. 
G- 4 . Clinton County, 1880. 
G b . Susquehanna and Wayne Counties, 1881. 
G p . Pike and Monroe Counties, 1882. 
G 7 . Wyoming, Lackawanna, Lucerne, Columbia, 
Montour and Northumberland Counties, 
1883. 
H 2 . Cambria County, 1877. 
H 3 . Somerset County, 1877. 
Atlas to Reports H 2 and H 3 . 
H 4 . Indiana County, 1878. 
H p . Armstrong County, 1880. 
H\ Jefferson County, 1881. 
H 7 . Clearfield County, 1884. 
I 2 . Oil Well Records in Venango, Warren, 
Crawford, Clarion, Armstrong, Butler, 
etc., 1877. 
I 8 . Venango, Warren, Clarion and Butler Oil 
Regions, with Atlas, 1880. 
I 4 . Warren County, 1883. 
I B . Oil and Gas, 1887-1888. 
K. Greene and Washington Counties, 1876. 
K 2 . Fayettp, Westmoreland, and S. E. Alle¬ 
gheny Counties, 1877. 
K s . Fayette and Westmoreland Counties, 1878. 
K 4 . Monongahela River Coal Mines, Pt. 1, 1884. 
L. Coke Manufacture and the Use of Natural 
Gas in Iron Making, 1876. 
M. Chemical Analyses in 1874-5, 1875. 
M 2 . Chemical Analyses in 1876-8, 1879. 
M 3 . Chemical Analyses in 1879-80, 1881. 
N. Tables of Elevations in Pennsylvania, 1878. 
O. Catalogue of Specimens in Geological Mu¬ 
seum, 1878. 
O 2 . Catalogue of Specimens in Geological Mu¬ 
seum, 1880. 
O 8 . Catalogue of Specimens, continued. 
