OldNYC: “This site provides an alternative way of browsing the NYPL‘s incredible Photographic Views of New York City, 1870s-1970s collection. Its goal is to help you discover the history behind the places you see every day. And, if you’re lucky, maybe you’ll even discover something about New York’s rich past that you never knew before! The images all come from the New York Public Library’s Milstein Collection. While many photographers contributed to the collection, the majority of its images are the work of Percy Loomis Sperr, who documented changes to the city from the late 1920s to the early 1940s. The Library retains the copyright for many of these images… The creators of this site did not collect or digitize any of these images — credit for that massive undertaking belongs entirely to the Library…If you’re more technically minded, you can find the source code for Old NYC on github…This collection of over 80,000 original photographs (and their captioned versos) of New York City from around the 1870s to 1970 is the most outstanding resource in the New York Public Library’s Irma and Paul Milstein Division of United States History, Local History and Genealogy.”