Geology topics
George H. Ashley
Publications and source records attributed to George H. Ashley.
Introduction. Stratigraphy and coal beds of the Indiana coal field. The Washburne lignite field, North Dakota. The Fort Berthold Indian Reservation lignite field, North Dakota. The Fort Peck Indian Reservation lignite field, Montana. The central part of the Bull Mountain coal field, Montana. The Milk River coal field, Montana. Notes on the coals of the Custer National Forest, Montana
No abstract available.
Bulletin↗
The valuation of public coal lands: The value of coal land; Depth and minimum thickness of beds as limiting factors in valuation
Explore the source record for details and available documents.
Bulletin↗
Twenty-Second Annual report of the Director of the United States Geological Survey, 1900-1901: Part III - Coal, oil, cement
No abstract available.
Annual Report↗
Ditney folio, Indiana
Explore the source record for details and available documents.
Folios of the Geologic Atlas↗