The New York Public Library (NYPL) has made its collection of 180,000 items in the public domain, including photographs, maps, sheet music, and books, publicly available online and published a machine-readable data set of the catalog to help users analyze the collection. The data set contains digitized versions of the works along with descriptive metadata, including author, date of creation, and language. NYPL has also created an application programming interface (API) to help users more easily work with the data.
Image: Diliff.