Browse Items (14 total) Tags: construction Browse All Browse by Tag Search Items Browse Map Sort by: Title Creator Date Added / 2 pages Batch plant Unknown Clyde Johnson outside Roberts Tunnel 1962 1962-11 Drilling in Roberts Tunnel 1957 1957-02-20 Group outside of East portal of Olympus Tunnel 1950 1950 Sort by: Title Creator Date Added / 2 pages Output Formats atom, dc-rdf, dcmes-xml, json, omeka-xml, rss2