Washer Women

 Those of us who've spent some time in the deserts of California will recognize where these women are standing.  Not an exact location of course.  More than likely there's a housing tract there now.   These three ladies are standing in a wash.  A desert wash is where the water goes after a sudden, desert rainstorm.  The mountain in the background would be where the flash flood happens, and the flat bare area is were the water spreads and percolates down into the water table.  There's nothing like the smell of the desert after a good rain.  From the late twenties to the early thirties would be my guess