Bookman's Price Index: A Guide to the Values of Rare and Other Out of Print Books

Hardback
Established in 1964, Bookman's Price Index is an index to rare and antiquarian books offered for sale in the catalogs of 100-200 book dealers in the U.S., Canada, and the British Isles. The number of titles listed in each volume is approximately 15,000; in the course of a year some 50-60,000 books are described.