Geology of the Aspen mining district, Colorado
Subtitle: with atlas
By: by Josiah Edward Spurr...
Series: United States. Geological survey. Monographs -- v. 31; Monographs of the United States Geological Survey -- v. 31.
Publisher: Govt. Print. Off.
Published: 1898
Place of publication: Washington
Subjects: Geology -- Colorado.; Silver mines and mining -- Colorado.