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    Crawford, Ian (1997) Galactic civilisations: a reply. Astronomy and Geophysics 38 (6), p. 19. ISSN 1366-8781.

    Crawford, Ian (1997) How common are technological civilizations? Astronomy and Geophysics 38 (4), pp. 24-26. ISSN 1366-8781.

    This list was generated on Wed Aug 17 03:09:36 2022 BST.