This photo was inside the Nightingale 1952 New England Sanitarium Year book, tucked inside the front cover.  I don't believe this photo looks like nurses from 1952.  I think it is more likely that they are from my grandmother's class in 1915 or around that time.  The names are written on the back.  Or at least most of them.

This is the alumni page.  Grace Hirst-Miles is listed in 1915.  She had her first child, Leon, in 1919.