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I, too, bought Koopowitz first. Then Birk. (both editions) Both books are "must have" books. I'd get the Cribb second edition next, followed by Slipper Orchids of Vietnam and The Genus Paphiopedilum in China - both wonderful books! All of these are important reference material if you want to be broadly informed. One book I still want and haven't yet bought is our "Guru" Olaf Gruss's one one the albino paphs. There are several other really cool older books, but these are all very current.