Catalog de timbre - Ştiinţă, tehnică, Olanda

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Image #1 of 4 Cent 1962 -Dial

4 Cent 1962 -Dial (NL779)

Image #1 of 4 Cent 1962 - Cooling Towers of the State Mines

4 Cent 1962 - Cooling Towers of the State Mines (NL790)

Image #1 of 10 Cents 1963 - Construcțiile Delta

10 Cents 1963 - Construcțiile Delta (NL800YxA)

Image #1 of 45 + 20 Cent 1968 - Zeeland Bridge (Oosterschelde Bridge)

45 + 20 Cent 1968 - Zeeland Bridge (Oosterschelde Bridge) (NL898)

Image #1 of 20 Cent 1972 - Delta Works

20 Cent 1972 - Delta Works (NL974)

Image #1 of 50 Cent 1973 - Weather Forecast

50 Cent 1973 - Weather Forecast (NL1016)

Image #1 of 35 Cent 1973 - Antenna

35 Cent 1973 - Antenna (NL1015)

Image #1 of 50 Cent 1975 - Metre Convention

50 Cent 1975 - Metre Convention (NL1056)

Image #1 of 55 Cent 1977 - Dentistry

55 Cent 1977 - Dentistry (NL1108)

Image #1 of 45 Cent 1977 - Diagram of Currents in water

45 Cent 1977 - Diagram of Currents in water (NL1107)

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