The Catalog of Copyright Renewal Records 1950-1977, published by the U.S. Copyright Office, contains a list of copyright registrations that helps determine who registered a copyright, what the copyright covers and whether a work is now in the public domain. Other works in this set are: (1950) ISBN 1432512234; (1951) ISBN 1432512242; (1952) ISBN 1432512250; (1953) ISBN 1432512269; (1954) ISBN 1432512277; (1955) ISBN 1432512285; (1956) ISBN 1432512293; (1957) ISBN 1432512307; (1958) ISBN 1432512315; (1959) ISBN 1432512323; (1960) ISBN 1432512331; (1961) ISBN 143251234X; (1962) ISBN 1432512358; (1963) ISBN 1432512366; (1964) ISBN 1432512374; (1965) ISBN 1432512382; (1966) ISBN 1432512390; (1967) ISBN 1432512404; (1968) ISBN 1432512412; (1969) ISBN 1432512420; (1970) ISBN 1432512439; (1971) ISBN 1432512447; (1972) ISBN 1432512455; (1973) ISBN 1432512463; (1974) ISBN 1432512471; (1975) ISBN 143251248X; (1976) ISBN 1432512498; (1977) ISBN 1432512501.