Atlas of the British flora.

A pioneering large-scale project in plant distribution cartography, containing 10-km square distribution maps for all non-critical native and frequently occurring alien vascular plant species found in Britain and Ireland. Followed by: Critical supplement to the Atlas of the British flora, edited by F. H. Perring, Assisted by P. D. Sell. (London: Published for the Botanical Society of the British Isles by Thomas Nelson and Sons Ltd., 1968). See 50 years of mapping the British and Irish flora 1962-2012 by Michael Braithwaite and Kevin Walker (London: The Botanical Society of the British Isles, 2012).