Πάιονηρ 2 (Greek Wikipedia)

Analysis of information sources in references of the Wikipedia article "Πάιονηρ 2" in Greek language version.

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sdfo.org

(1959-02-18). "1958 NASA/USAF Space Probes (ABLE-1) Final Report: Volume 1. Summary" (PDF). Space Technology Laboratories. Ανακτήθηκε στις 2009-02-17.