International Planetarium Society (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "International Planetarium Society" in English language version.

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"Historical Aspects of the International Planetarium Society," Paul R. Engle, Planetarian, Vol. 11 No. 2
"A Forty-year Perspective of the International Planetarium Society," Dave Weinrich, Proceedings of the 47th Annual GLPA Conference in Champaign, Illinois, October 19–22, 2011
Awardees and Fellows of the International Planetarium Society