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1. Montana. Bitterroot Mountain tunnel

Notes:
Tunnel in the Bitterroot Mountain range of the Rocky Mountains in western Montana.
Date Created:
1914-01-01T00:00:00Z
Data Provider:
Grand Valley State University. University Libraries

2. Indiana. Railroad tunnel

Notes:
Railroad tunnel at Madison, Indiana.
Date Created:
1929-01-01T00:00:00Z
Data Provider:
Grand Valley State University. University Libraries