مصادر الصور
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(1-1) © Photo Jonathan Peppé.
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(2-1) © The British Library Board.
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(3-1) © Wikipedia Commons.
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(4-1) © Photo Mary Walmsley.
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(4-2) © Photo Mary Walmsley.
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(4-3) © Photo Mary Walmsley.
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(4-4) © Photo Mary Walmsley.
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(6-2) © Wikipedia Commons.