1956 Air Letter Sheet
 |
sALS 10
| Watermark | Year issued |
|---|---|
| L | 1956[1] |
| P | 1956[2] |
| S | 1956[2] |
| T | 1956[3] |
Further reading
- "Aero Postal Stationery Notes" / p. 172 / The Airpost Journal / Whitman, Sol / Mar 1957
- "Recent Aerogrammes" / p. 266 / The Airpost Journal / Guthrie, Walter R. / Jul 1963
- "Recent Aerogrammes" / p. 219 / The Airpost Journal / Guthrie, Walter R. / May 1964
- Kessler's Catalogue of Aerograms, Volume II / Kessler, F.W. / 1968
- Liberian Postal Stationery / Shoemaker, Dr. Robert E. / 2012
References
1. "Aero Postal Stationery Notes" / p. 172 / The Airpost Journal / Whitman, Sol / Mar 1957
2. "Recent Aerogrammes" / p. 266 / The Airpost Journal / Guthrie, Walter R. / Jul 1963
3. "Recent Aerogrammes" / p. 219 / The Airpost Journal / Guthrie, Walter R. / May 1964