A supplement to the Yorkshire floras [i.e. to the flora of West Yorkshire, by Frederic A. Lees, North Yorkshire, by John Baker, and the flora of the East Riding of Yorkshire, by James F. Robinson]. By ... F. Arnold Lees ... /
West Riding Consolidated Naturalists' Society, afterwards Yorkshire Naturalists' Union (Huddersfield)
Cheetham, C. A.
Sledge, W. A.
London, 
[1941]