1 86 ADBITIOXS TO TKE LIBEAIRT. 



Hg. Eeport of Progress in the Cambria and Somerset District 

 of the Bituminous Coal Pield^ of Western Pennsyl- 

 vania, Part I., by P. and W. G. Piatt. 8vo. Har- 



rishurg, 1877. 



H3. , Part II., by P. and W. G. Piatt. Svo. Harris- 

 burg, 1877. 



H^. Eeport of Progress in Indiana County, by "W. G. Piatt. 



8vo. Harrisburg, 1878. 

 Hg. Eeport of Progress in Armstrong County, by W. G. Piatt. 



8vo. Harrisburg, 1880. 



Hg. Eeport of Progress in Jefferson County, by W. G. Piatt. 

 8vo. Harrisburg, 1881. 



H7. A Eevision of the Bituminous Coal Measures of Clear- 

 field County, by H. M. Chance. 8vo. Harrisburg, 

 1884. 



I. Eeport of Progress in the Yenango County District, by 

 John P. CarU, with Observations on the Geology 

 around Warren, by P. A. EandaU, and Note on the 

 comparative Geology of north-eastern Ohio and north- 

 western Pennsylvania and western New York, by 

 J. P. Lesley. 8vo. Harrisburg, 1875. 



Ig. Eeport of Progress, Oil-well Eecords and Levels, by John 

 P. CarU. 8vo. Harrisburg, 1877. 



13. The Geology of the Oil Eegions of Warren, Yenango, 



Clarion, and Butler Counties, including Surveys of the 

 Garland and Panama Conglomerates in Warren and 

 Crawford, and in Chatanqua Co., N. T. ; descriptions 

 of Oil-well rig and tools, and a discussion of the Pre- 

 glacial and Postglacial drainage of the Lake-Erie 

 country, by John P. CarU. 8vo. Harrisburg, 1880. 

 With maps, &c. 



14. Geological Eeport on Warren County and the neighbour- 



ing Oil Eegions, with additional OU-weU Eecords, by 

 J. P. CarU. 8vo. Harrisburg, 1883. 



J. Special Eeport on the Petroleum of Pennsylvania, its pro- 

 duction, transportation, manufacture, and statistics, 

 by Henrj^ E. Wrigley. 8vo. Harrisburg, 1875. 



K. Eeport of Progress in the Green and Washington District 

 of the Bituminous CoalPields of Western Pennsylvania, 

 by J. J. Stevenson. Svo. Harrisburg, 1876. 



Kj. Eeport of Progress in the Payette and Westmorelajid 

 District of the Bituminous Coal Pields of Western 

 Pennsylvania, Part I., by J. J. Stevenson. 8vo. 

 Harrisburg, 1877. 



K . , Part II., by J. J. Stevenson. Svo. Harrisburg, 



1878. 



