"This database makes searchable the copyright renewal records received by the US Copyright Office between 1950 and 1992 for books published in the US between 1923 and 1963. Note that the database includes ONLY US Class A (book) renewals." Records include title, author, registration and renewal dates, registration number, renewal ID, and renewing entity. Searchable, or browse records by year, title, or author. From Stanford University Libraries.