Professional Rare Stamp Hunter's Guide Book: An Encyclopedia of the Rare Stamps of the World ~ by Vernon E. Baker. Published by the author, circa 1941. Elyria, Ohio. Saddle stitched, about 80 pages, various advertising inserts, $1 cover price. This particular copy, I suspect, circulated in around 1946 based on the dates in the advertising. Lots of information on rare stamps and Mr. Baker's buying prices for perfect examples. I had hours of fun looking through the list and wishing the prices were still valid.