International Hydrological Decade 1974
Сега се прикажува: Чехословачка - поштенски марки - 1974 - International Hydrological Decade - 5 марки.
1974
International Hydrological Decade
25. Април ВМ, Управување со отпад: Ништо Дизајн: J. Liesler Перфорација: 11¾
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