The New Encyclopedia Britannica : volume 16
Encyclopedia Britannica, 1983
 Buku Referensi
The New Encyclopedia Britannica : volume 17
Encyclopedia Britannica, 1983
 Buku Referensi
The New Encyclopedia Britannica : volume 18
Encyclopedia Britannica, 1983
 Buku Referensi
The New Encyclopedia Britannica : volume 19
Encyclopedia Britannica, 1983
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Encyclopedia of associations : volume III, new associations
editor, Frederick G. Ruffner, Ann C. Thomas, Ann Underwood, Mangoret Fisk, Harold C. Young
Gale Research, 1964
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