Name: Reine Cleveland, Texas (Zone 9a) On the 3rd day God created plants.
A lot of times I check out used book sites to find a bargain. Even if you don't know the title of a specific book, just type in a keyword. In this case "adeniums". Hope this helps.
BTW I have always been satisfied buying used books from these sites. Read description of condition to help you decide if a particular book is acceptable to you. Compare different sites for price, condition, shipping, etc.
