FYI: about 190k of these pictures are public domain respectively without known copyright protection.<p>Link for searching these pictures: <a href="http:&#x2F;&#x2F;digitalcollections.nypl.org&#x2F;search&#x2F;index?utf8=%E2%9C%93&amp;keywords=&amp;filters%5Brights%5D=pd" rel="nofollow">http:&#x2F;&#x2F;digitalcollections.nypl.org&#x2F;search&#x2F;index?utf8=%E2%9C%...</a>