Internasionale Sterrekundige Vereniging: Verskil tussen weergawes
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Lyn 151:
* {{en}} [http://www.astronomy2018.org/ XXXste Algemene vergadering 2018]
* {{en}} [http://www.astronomy2021.org/ XXXIste Algemene vergadering 2021]
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[[Kategorie:Internasionale organisasies]]
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