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"Per first mail" from Curacao (Willemstad) Dutch West Indies to Malta : 24 June 1932
The late 1970s bubble in Dutch collectible postage stamps
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3.
Chinese correspondence in Dutch East Indies (1865-1949)
Gozo Philatelic Society Newsletter : no. 32 : April-June 2008
Gozo Philatelic Society Newsletter : no. 56 : April-June 2014