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1898
Spurr, Josiah Edward
Aspen District Sheet.
Geologic Atlas
1898
Spurr, Josiah Edward
Tourtelotte Park Special.
Geologic Atlas
1898
Spurr, Josiah Edward
Tourtelotte Park Special.
Geologic Atlas
1898
Spurr, Josiah Edward
Tourtelotte Park Mining Dist …
Geologic Atlas
1898
Spurr, Josiah Edward
Aspen Mountain Sheet.
Geologic Atlas
1898
Spurr, Josiah Edward
Smuggler Mountain.
Geologic Atlas