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[i]Special cancellations for anniversaries of space events should be avoided except when no original event cancellation is available.[/i] (Astro Guidelines, Article 3. Principles of Exhibit Composition, Point 3.2.3).
[i]For different national space programmes the national mission control centres are responsible. Postmarks from tracking sites participating in the mission may be shown as a supplement.[/i] (Astro Guidelines, Article 3. Principles of Exhibit Composition, European Space Programmes, Point 3.3.15).
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