Stamps Category Checoslovaquia 1963 1969

Union Congress.
josep colomer valls
Union Congress.
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Union Congress.
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75th Anniversary of the birth of Bohuslav Martinu.
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Ludovit Stur.
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Centenary of the death of Josef Navratil.
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550th Anniversary of the death of Jan Hus.
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Gregor J. Mendel.
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3rd National Spartakiad in Prague.
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4th Congress of European Cardiology in Prague.
josep colomer valls