The hard way to the north pole en NATIONAL GEOGRAPHIC, BOLETINES DE : NATIONAL GEOGRAPHIC ([19/02/2013])
[artículo]
[artículo] The hard way to the north pole [texto impreso] . - pp 124-134. PP - MFN 117 - NATIONAL GEOGRAPHIC - March 1991 v.179 nº3 Idioma : (En) in NATIONAL GEOGRAPHIC > BOLETINES DE : NATIONAL GEOGRAPHIC [19/02/2013] . - pp 124-134
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