Special report on the coke manufacture of the Youghiogheny river valley in Fayette and Westmoreland counties. With geological notes of the coal and iron ore beds. From surveys by Charles A. Young. By Franklin Platt. To which are appended: I. A report on methods of coking. By John Fulton ... II. A report on the use of natural gas in the iron manufacture. By John B. Pearse and Franklin Platt.

L vii, 252 L p., 1 l. front., illus., plates (part fold.) maps (part fold.) diagrs. 22 1/2cm.At head of title: Second geological survey of Pennsylvania. 1875."Analyses of gas issuing from oil wells, by Samuel P. Sadtler": p.146 L-160 L."The Boyd's Hill gas well at Pittsburgh, by J.P. Lesley": p. L 217-L 237