'Haworthia Update Essays on Haworthia. Volume 7. Parts 1-4'
Another bumper collection of articles on his field studies on these variable plants. Importantly it also contains a new species list in accordance with the ICBN, finally complying with the Code to ensure his classification is acceptable to the scientific community with his names are now in the form of species and varieties. Produced in 4 physical parts with 63, 83, 57 and 48 pages each, and 330, 280, 330 and 160 colour photos respectively, printed on A4 sheets folded and stapled. 2012 11 ¾ x 8 ¼
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