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Annie J. Cannon
Don Yost
Tandem trucking of horseshoe section
Hydrodynamics lab
Lifting second yoke girder
Royal Sorensen’s first high voltage transformer
Auto road to Mt. Wilson
Owens Valley Radio Observatory (OVRO), construction
Geology Division
Dignitaries at the dedication of the 200″ telescope
H. C. Yin and Norman Horowitz