Alice Mary Robertson became the first woman to govern the US House of representatives.
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America's robot spacecraft, the Viking I, successfully landed on Mars.
Linkin Park singer Chester Bennington committed suicide aged 41.
Single 'In-a-gadda-da-vida' by Iron Butterfly became the first heavy metal song to hit the charts.
Jane Asher broke up her engagement to Paul McCartney live on television.
The Battle of Ankara commenced when Turco-Mongol conqueror Timur invaded Anatolia.
