Britain's orchids: a guide to the identification and ecology of the wild orchids of Britain and Ireland.
Princeton: Princeton University Press/WILDGuides, 2004. Octavo, laminated boards, colour photographs. A comprehensive photographic guide to the orchids of Britain and Ireland, covering the 51 species recorded, including all the varieties and sub-species, as well as 9 species of uncertain or doubtful provenance. More