Here are several other examples of that photo:
http://www.tineye.com/search/762ae7d...22cf62bb8d8a9/
Unfortunately most of those links don't lead back to actual information on the date, photographer, etc.
Getty Images says 1951, but without a photo credit.
http://www.gettyimages.com/detail/ne...-photo/2793221
ADDING: RPPC paper stock was sold in bulk, it would not be a huge surprise if paper that was discontinued in 1950 was used to print a photo in 1951.
David