99-0823-28 Add to clipboard Item 1999 Part of Chris Tumbusch Photographs Construction of Keck Observatory
99-0824-01 Add to clipboard Item 1999 Part of Chris Tumbusch Photographs Construction of Keck Observatory
99-0827-08 Add to clipboard Item 1999 Part of Chris Tumbusch Photographs Construction of Keck Observatory
99-0827-15 Add to clipboard Item 1999 Part of Chris Tumbusch Photographs Construction of Keck Observatory