It does not matter when a book was first written. If it's for sale, it can be listed. Non-book material is not included. Out of print books are sold by antiquarian or used book dealers. Check in the yellow pages or on the Internet for lists of dealers.
Internet sites list books for sale, too.
The information under each is the same. It gives author, title, publisher, date of publication and price. There is also a separate volume listing publishers and their addresses and another volume that lists books declared out of print or indefinitely out of stock since the previous edition of BIP . The listings in BIP are sorted by computer which leads to some filing problems. Note the section on authors names.