General Catalogue of Nebulae and Clusters (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "General Catalogue of Nebulae and Clusters" in Polish language version.

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1web.archive.org

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web.archive.org

Harold G. Corwin, Jr.: An Historical Perspective. NGC/IC Project, 1999-10-12. [dostęp 2017-01-12]. (ang.).