George G. Harrap & Co., 1963. 1st edn. 8vo. Original dark blue lettered light blue cloth (top edges lightly spotted; bottom corners bumped, otherwise VG), dustwrapper (a few small nicks at edges - in protective wrapper). Pp. 149 (previous owner's bookplate on front endpaper; endpapers lightly tanned).
Oliver & Boyd, 1970. 6th edn 2nd imp. 4to. Original gilt lettered blue cloth (bumped at head and tail of spine, some light marking on boards - otherwise bright VG), no dustwrapper. Pp. x + 146, illus with equations and tables (previous owner's neat inscription on front free endpaper, extensive annotations (mainly pencilled)).