OK I got it from a very reliable source Joe Frank posted these for me. it is looking SE (in direction towards Prospect Park further SE) along 10th Street from between 3rd Avenue towards 4th Avenue and the building of the sub-steelwork of the new IND 4th Avenue Station (later encased in concrete and brick) of the IND huge viaduct portion over the Gowanus Canal. View is about 1929-30.