ADEN – Robertshaw, M. H.: The Postmarks of ADEN. Postal Markings 1839–1939 (1946), 23 pages, hardcover, numbered edition of 50 copies printed and signed by the author (this is No. 44), good condition, cover slightly stained; PLUS: Pratt, R. W.: The Postal History of British Aden (1839–1967), 1985, 274 pp., hardcover, good condition. Estimate: 70 Euro
