When blue is blue

Scientific treatise and study on the composition of the paint on the Protectorate 5h blue linden leaf stamp. Study of the dependence of the amount of paint on the color shade of postage stamps.

03. 05. 2025
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Commemorative Postmark

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06. 11. 2010
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01. 11. 2010
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22. 10. 2010
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03. 10. 2010
International Peace Marathon 2010
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International Peace Marathon 2010
26. 09. 2010
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25. 09. 2010
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25. 09. 2010
90 years of the philatelic club in Ruzomberok
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90 years of the philatelic club in Ruzomberok
24. 09. 2010
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23. 09. 2010
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17. 09. 2010
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15. 09. 2010
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10. 09. 2010
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04. 09. 2010
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28. 08. 2010
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28. 08. 2010
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27. 08. 2010
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21. 08. 2010
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15. 08. 2010
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31. 07. 2010
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28. 07. 2010
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27. 07. 2010
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26. 07. 2010
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