Collier's encyclopedia : volume 20
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 21
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 22
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 23
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 24
Macmillan Educational Company, 1990
 Buku Referensi
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