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RUHSAM, M. Coryphantha. R.F. Dicht & A.D. Lüthy. Berlin, Heidelberg: Springer-Verlag. 2005. 200pp, Colour Plates, Drawings, Maps. ISBN 3 540 22306 1. £61.50 (hardback). Edinburgh J. Bot. 2005, 61 (2-3), 201-202. https://doi.org/10.1017/S0960428605290273.