Collier's encyclopedia : volume 10
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 11
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 12
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 13
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 14
Macmillan Educational Company, 1990
 Buku Referensi
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