receive another 47 years of protection.
Renewal information. You're correct that not all renewal information migrated to the online database. As the folks at the Stanford Library explain, some of the renewal information was slow to move from the Copyright Office print card catalog into the searchable database. (You can read more about the card catalog here.) Stanford sought to correct that with its alternative renewal search system for books. Check that out as well as Rutger's database, and the University of Pennsylvania's online attempt to organize copyright renewal records by year. The most thorough (and expensive) way to verify renewal information is to hire someone to perform a copyright search. You can hire the Copyright Office for $165 an hour, or you can hire a private company to perform the card catalogue search.