I also downloaded the "Hashish" book as well. The information is quite old but an interesting read. I will say the newest and best information is on here, AFN, from all the top hash aficionados around, or any of the Frenchy Cannoli articles and videos. I did hope to find an inexpensive hardcover version but yesh, $500 was the cheapest I saw here stateside and that was for a used beatup paperback.
A good read but not worth the price.