Gegenschein (Basque Wikipedia)

Analysis of information sources in references of the Wikipedia article "Gegenschein" in Basque language version.

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archive.org

(Ingelesez) Sheehan, William. (1995). The immortal fire within: the life and work of Edward Emerson Barnard. Cambridge University Press, 69–70 or. ISBN 0-521-44489-6..