Collier's encyclopedia : volume 15
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 16
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 17
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 18
Macmillan Educational Company, 1990
 Buku Referensi
Collier's encyclopedia : volume 19
Macmillan Educational Company, 1990
 Buku Referensi
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