There are two sets.
Each set contains Photographs taken by the Historic American Buildings Survey in 1939.
Library of Congress, Prints and Photographs Division, Historic American Buildings Survey or Historic American Engineering Record,
Reproduction Number (Ex:"HABS,ILL,16-CHIG,33-2")
The Van Ness Homestead in Fairfield, New Jersey (still standing)
(This set also contains some photos taken around 1900)