Tolken, H R
'A Revision of the Genus Crassula in Southern Africa'
Contributions from the Bolus Herbarium No. 8 Part 1 & 2 A technical book which revises the genus and gives detailed descriptions, distribution and other details. 1977 9 ½ x 7 two volumes 595 pages
Comments: Spines of both volumes quite faded, Second hand book – please see important information
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