The international hydrological decade
- Catalog #
- 3410
- Date of Issue
- 1966 12 October
- Denomination
- 6k
- Color
- Multicolor
- Artist
- Trifonov B.
- Printing method
- Bar offset
- Perforation
- Comb 11½
- Issued
- 4,000,000
- Description
- The emblem of the International hydrological decade. Schematic representation of the water cycle in nature.
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