Scientific Publication No 20: A Key To The Nymphs Of The British Species Of Ephemeroptera With Notes On Their Ecology T. T. Macan
1961. No Edition Remarks. 63 pages. Beige 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 rolling and creasing.