BNY, from about 1900 to beginning of World War II

BNY, from about the middle of WWII to its closing

Both these maps are approximately 600 pixels wide and have been shrunk to
save loading time.  If you are interested in reading the labels on the
maps, you should download them and then enlarge them on your computer.

Both maps come from Record Group 181, National Archives, New York City 
branch.