The New book of knowledge : volume 13
Grolier Incorporated, 1997
Buku Referensi
Virtue's new treasury of knowledge : volume 1
Virtue, 1974
Buku Referensi
Encyclopedia of knowledge : volume 1
Grolier Incorporated, 1991
Buku Referensi
The World book encyclopedia : volume 1, A
Field Enterprises Educational Corporation, 1963
Buku Referensi
The World book encyclopedia : volume 1
World Book, 1985
Buku Referensi
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