George Hall Ashley

Rhode Island Coal

George Hall Ashley

1915

The Establishment, Purpose, Scope and Methods of the State Geological Survey

George Hall Ashley

1910

The Canadian system

George Hall Ashley

1928

Classification and nomenclature of rock units

George Hall Ashley

1933

Oil and Gas Fields of Pennsylvania

George Hall Ashley

2018

Establishment, Purpose, Scope and Methods of the State Geological Survey

George Hall Ashley

2018

Punxsutawney quadrangle; geology and mineral resources / by George H. Ashley. Prepared in cooperation with the United States Geological survey

George Hall Ashley

1926

The story of the Pennsylvania survey

George Hall Ashley

1921

The story of the Pennsylvania survey / by George H. Ashley.

George Hall Ashley

1921

Curwensville quadrangle

George Hall Ashley

1940

A syllabus of Pennsylvania geology and mineral resources / by George H. Ashley.

George Hall Ashley

1931

The scenery of Pennsylvania

George Hall Ashley

1933

Drainage Reclamation in Tennessee, First Papers: Drainage Peoblems [!] in ...

George Hall Ashley

1910