What part of the Moon surface had been known to humanity before the first photos of the dark side were taken in 1959?

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Moon's libration changes the angle from which the Moon is seen, allowing about 59% of its surface to be seen from the Earth (but only half at any instant). Moon's libration is caused by the eccentricity of its orbit around Earth and by a slight inclination of its axis of rotation.
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flagIraq
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flagSouth Africa
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flagFrance
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flagthe United Kingdom
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flagthe United Arab Emirates
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flagthe Philippines
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flagRepublic of Ireland
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flagIndia
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flagthe Netherlands
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flagGermany
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flagPakistan
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flagthe United States
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flagGreece
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flagIndonesia
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flagAustralia
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flagUnknown
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flagCanada
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flagRwanda
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