La Palma Deklaration

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La Palma Deklaration zum Schutz des Nachthimmels und des Rechts auf Sternlichts vom IAC/UNESCO Symposium zum Schutz des Nachthimmels

Starlight Reserve Entwurf: Einrichtung von Sternlicht-Parks (Entwurf, Sommer 2008).

WH --GW (talk) 15:05, 28 April 2016 (CEST)