la stratigraphie et les subdivisions du temps géologique تقديم الدرس بالداريجة
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=0z4JKQ1Cz4Q
Phénomènes géologiques externes - L'étude morphoscopique du sable - Calcul du pourcentage des grains NU - EL - et RM . 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