An inventory of all known material preserved in what is now known as the "Ritter archive", the seed samples which were collected by Friedrich Ritter from the early 1950s until the 1970s, and which represent a remarkable source of information for future succulent research.
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I don't know how you got a book printed 26 years ago in the conditions that I received it (like new) but you do it! ABSOLUTELY AWESOME!
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