A 1987 vintage reference book, Locke Art Glass A Guide for Collectors With Photographic Illustrations of 190 Examples by Joseph H. and Jane T. Locke.  This contains the reproduction of an original sales catalog, from 1905, showing examples of his glassware that was available at that time, along with their prices.  Also included is a biography of Locke along with other interesting glass information. 
 
The book is 8 1/2 by 11 1/4 soft cover with 64 pages and is in good, used condition with no missing or torn pages, one page has some underlines.