Grolier family encyclopedia : volume 18
Grolier Incorporated, 1995
 Buku Referensi
The World book encyclopedia : volume 18
World Book, 1984
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 18
Americana Corporation, 1960
 Buku Referensi
The World book encyclopedia : volume 18, U-V
Field Enterprises Educational Corporation, 1963
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Collier's encyclopedia, with bibliography and index : volume 18
P.F. Collier & Son, 1954
 Buku Referensi
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