Amateur Astronoom
Alles over sterrenkunde en ruimtevaart.
Observatoria
Wikipedia contributors. List of astronomical observatories [Internet]. Wikipedia, The Free Encyclopedia; 2014 Dec 24, 16:33 UTC [cited 2014 Dec 30]. Available from:
http://en.wikipedia.org/w/index.php?title=List_of_astronomical_observatories
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