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Crawford, Ian (2009) The astronomical, astrobiological and planetary science case for interstellar spaceflight. Journal of the British Interplanetary Society 62 (11-12), pp. 415-421. ISSN 0007-084X.
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Crawford, Ian (2009) The astronomical, astrobiological and planetary science case for interstellar spaceflight. Journal of the British Interplanetary Society 62 (11-12), pp. 415-421. ISSN 0007-084X.