At the New York Academy of Music, an exclusive venue for opera from 1854, 18 private boxes were monopolised by an old elite of Roosevelts, Stuyvesants and others.

ECONOMIST: High society in New York

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BBC: Your guide to the BBC Embedded Media Player

As the situation in the north remained volatile, however, the rescue operation continued for three months after the rebel withdrawal, until 2, 400 metal boxes containing an estimated 285, 000 manuscripts had been delivered to private homes in the capital.

BBC: How Timbuktu's manuscripts were smuggled to safety