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The first volume in a series of 10 covering Euphorbia. First edition of Vol 1 came out in 1983 with additional volumes in following several years. A must have for the serious Euphorbia enthusiast and collector. Pricey for the entire 10 volumes, but worth the search to complete the set. Available at various prices by doing an online search.
On February 9th, 2004, Happenstance added the following:
Also comes as a 10 Volume Set, usually in the $400-$500 range for all 10 volumes with cumulative indexes.