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Majalah, Jurnal, Buletin
National Geographic Indonesia
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Majalah, Jurnal, Buletin
Macdonald, Phil
National Geographic Traveler Thailand
National Geographic, 2009
Buku Teks SO
National Geographic 100 Big Ideas
Nasional Geographic, 2009
Buku Teks SO
National Geographic on Indians of the Americas / edited by Matthew W.Stirling
National Geographic Society, 1955
Buku Teks SO