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(1971). Airmails: 1870–1970. London: B.T. Btaford. pp. 147–148. ISBN 0713403802. "Arago Glossary". National Postal Museum. Archived from the original...10 KB (928 words) - 06:18, 17 April 2023
(1971). Airmails 1870–1970. London: B.T. Batsford Ltd. pp. 17–18. ISBN 0-7134-0380-2. Lowe's Official Report Part I. .p.202 .p.448 .p.448 Chisholm, Hugh...12 KB (1,631 words) - 04:40, 12 April 2024- IPC Magazines, 1970 Airmails, 1870-1970, Batsford, 216 pp, 1971, ISBN 0-7134-0380-2 The World of Classic Stamps; 1840-1870, New York: Putnam, 1972. The...16 KB (2,165 words) - 23:02, 5 February 2024
Mackay, James A. (1971). Airmails 1870–1970. London: B.T. Batsford. ISBN 0713403802. OCLC 152505. Ganz, Cheryl (2011-01-25). "India and the World's First...8 KB (866 words) - 19:45, 25 January 2024
A. (1971). Airmails 1870–1970. London: B. T. Batsford. p. 216. ISBN 0-7134-0380-2. Simine Short; Cheryl Ganz, eds. (1992). Via airmail: An Aerophilatelic...39 KB (4,753 words) - 23:55, 12 May 2024
