Classic postcards of Tarrytown's treasures

A set of very old postcards of Tarrytown's architectural and historical treasures was among the items my father had in his collection of letters and documents, probably purchased during his teenage years. The postcards are undated, but must be from the 1930s, for several good reasons. The Lyndhurst postcard states that it is the residence of Mr. and Mrs. Finley J. Shepard. Mrs. Shepard was none other than Helen Gould, the daughter of railroad magnate Jay Gould who owned Lyndhurst until his death in 1892, at which point Helen took charge of the estate. She passed away in 1938. Additionally, another postcard is of the beautiful Warner Library, construction of which started in 1928; the dedication ceremony was held in 1929, and my best guess is that artistic renderings of the library flourished during the 1930s. My father was born in 1918 in Tarrytown and would have been a teenager during the 1930s; assuming that he would not have started collecting such cards until he was twelve or thirteen years old, it makes sense that these postcards are from that time. Just like the Cambridge postcards, the front sides of the Tarrytown postcards state specifically what is depicted on them, which I find very useful.