The New Encyclopaedia Britannica : volume 12
Encyclopaedia Britannica Inc., 1978
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The New Encyclopaedia Britannica : volume 13
Encyclopaedia Britannica Inc., 1978
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The New Encyclopaedia Britannica : volume 14
Encyclopaedia Britannica Inc., 1978
 Buku Referensi
The New Encyclopaedia Britannica : volume 15
Encyclopaedia Britannica Inc., 1978
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The New Encyclopaedia Britannica : volume 16
Encyclopaedia Britannica Inc., 1978
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