And finally....
Oriental Adventures
1st Edition
Kara Tur
1985
What can you say about this product that has not been said already? I guess you could say it sucked – no one has ever said that. Replacing the normal classes and races with all new ones, and yet retaining the basic rules for AD&D, this book became arguably the single iconic book of AD&D 1th Edition and was one of the best selling ones of all time, period. From the new spells, new elemental system, new everything – including a new world, Kara-Tur detailed very well – you have one of the best supplements of all times, an d the best one for 1st Edition. It still has stuff in it that was never redone for later editions, and thus stands up very well. Oh, and did I mention it introduced non-weapon proficiencies?