Books by Ashley, Geo. H.
Curwensville quadrangle
Curwensville quadrangle
The emergence of ideas as illu
The emergence of ideas as illustrated from geology
The undeveloped mineral resour
The undeveloped mineral resources of Pennsylvania
A syllabus of Pennsylvania geo
A syllabus of Pennsylvania geology and mineral resources
Pennsylvanian cycles in Pennsy
Pennsylvanian cycles in Pennsylvania
Punxsutawney quadrangle
Punxsutawney quadrangle
Future use of raw coal
The oil and gas fields of Pennsylvania
A high-grade building stone in Greene County
Future sources of power
Geology of oil and gas in relation to coal
The story of the Pennsylvania survey
Decline of McKeesport gas pool
Development and probable life of gas pool at McKeesport, Pennsylvania
Effect of the war on the price of coal in Pennsylvania
Cannel coal in the United Stat
Cannel coal in the United States
A brief summary of the resources of Tennessee
The valuation of public coal l
The valuation of public coal lands
Geology and mineral resources
Geology and mineral resources of part of the Cumberland Gap coal field, Kentucky
Geology of the Paleozoic area of Arkansas south of the novaculite region
An illustration of the flexure
An illustration of the flexure of rock