Watson, E Vernon British mosses and liverworths: An introductory work, with full descriptions and figures of over 200 species, and keys for the identification of all except the very rare species - Cambridge: The University Press, 1966 - xvi, 419p. Subjects--Topical Terms: Great Britain Subjects--Index Terms: Liverworts Universal Decimal Class. No.: 582.32/.34 / K6