Polish stamps "Groszy" overprints: Complete official story of "Groszy" overprints on Polish stamps 1946/50, revaluation, October 29, 1950
[rk. 2]
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Polish post seven years war: A complete record of all stamps, seals, field-posts ad labels issued by the Polish postal authorities at home and abroad during the six years' war, from 1939 to 1945