00-0257-12
Keck Observatory under construction
00-0257-17
Keck Observatory under construction
00-0257-19
Keck Observatory under construction
00-0257-21
Keck Observatory under construction
00-0293-04
Keck Observatory under construction
00-0293-07
Keck Observatory under construction
00-0293-21
Keck Observatory under construction
00-0405-18
Keck Observatory under construction
99-0824-13
Construction of Keck Observatory
99-0824-17
Construction of Keck Observatory