Geology of the Sierra Diablo region, Texas; with special determinative studies of Permian fossils
No abstract available.
Texas↗
Geology topics
Helen Duncan
Publications and source records attributed to Helen Duncan.
Stratigraphy and paleontology of the uppermost Pennsylvanian and lowermost Permian Rocks in Kansas
No abstract available.
Kansas↗
Ordovician and Silurian coral faunas of western United States
Explore the source record for details and available documents.
Bulletin↗
Fluorspar deposits in western Kentucky, part 1: Introduction
Explore the source record for details and available documents.
Bulletin↗