The Potomac formation
Published: 1900
Place of publication: n.p
Language: eng
Number of pages: 90
Subjects: Stratigraphic Geology; Geology
Notes: Bound with his Some analogies in the Lower Cretaceous of Europe and America.  1895-6.

Extracts from 15th [and] 16th Annual Reports of the U.S. Geological Survey, 1893-5.