Whitaker's almanack 1991
J. Whitaker and Sons, 1990
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Whitaker's concise almanack 1994
J. Whitaker and Sons, 1994
 Buku Referensi
Whitaker`s almanack 1994
J. Whitaker & Sons, 1994
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Daily Mail year book 1987
edited by P. J. Failes
Associated Magazines, 1987
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The aviation & aerospace almanac 1997
executive editor Richard Lampl
Aviation Week Group, 1997
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