The knowledgebook : everything you need to know to get by in the 21st century
National Geographic Society, 2007
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The Great family encyclopedic dictionary
Bay Books, 1986
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Encyclopedia of knowledge : volume 8
Grolier Incorporated, 1991
 Buku Referensi
Encyclopedia of knowledge : volume 7
Grolier Incorporated, 1991
 Buku Referensi
Encyclopedia of knowledge : volume 6
Grolier Incorporated, 1991
 Buku Referensi
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