No known restrictions on images made by the U.S. Government; images copied from other sources may be restricted. (http://www.loc.gov/rr/print/res/114_habs.html). It is the user's obligation to determine and satisfy copyright or other use restrictions when publishing or otherwise distributing materials found in the Library of Congress Prints & Photographs Division's collections.
Source:
Historic American Buildings Survey, Prints and Photographs Division, Library of Congress, Washington D.C. https://www.loc.gov/pictures/resource/hhh.wa0075.photos.168469p/
