Undated but circa 1950. 126pp, with black and white illustrations in text and one fold-out coloured chart at rear. In limp card covers with yapped edges. 8vo. Covers are heavily rubbed and chipped at edges, stained and marked, with oxidisation around staples. Some staining inside covers. Endpapers and title page have some patchy browning else internally really quite bright and clean. Firmly bound.
