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  1. 1

    Saltpeter the mother of gunpowder nork Cressy, David

    Argitaratua 2013
    Liburua

    Saltpeter the mother of gunpowder
  2. 2

    Science in traditional China a comparative perspective nork Needham, Joseph

    Argitaratua 1981
    Liburua

    Science in traditional China a comparative perspective

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