Stages of Construction in the Building of the Boulder Dam

Front:
STAGES OF CONSTRUCTION IN THE BUILDING OF BOULDER DAM ALL VIEWS TAKEN FROM THE SAME POINT, LOOKING UPSTREAM COMMENCEMENT OF CONSTRUCTION 1931 FIRST CONCRETE POURING 1933 THE DAM HALF COMPLETED 1934 BOULDER DAM TODAY 1936

Back:
Si Pub. by Frasher's, Inc., Pomona, Calif.