1956 Air Letter Sheet
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
  • 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

See also

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