A Key to the British Species of Freshwater Triclads (Turbellaria, Paludicola) (Freshwater Biological Association. Scientific Publications;no.23) T. B. Reynoldson
1967. No Edition Remarks. 28 pages. Blue paper covers. Black and white illustrations throughout. Pages are bright and clear with light tanning to text block edges. Binding remains firm. Paper covers have light edge-wear and corner curling. Spine has minor tanning, rolling and creasing.