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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flagAustria
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13
flagSingapore
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61%
7%
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flagFrance
29%
58%
4%
4%
24
flagSouth Africa
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flagPoland
35%
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7%
3%
19073
flagthe United Kingdom
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9%
4%
286
flagNew Zealand
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3%
7%
26
flagRepublic of Ireland
36%
48%
15%
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33
flagthe Philippines
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45%
10%
6%
90
flagthe Netherlands
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4%
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flagIndia
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10%
4%
837
flagGermany
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43%
9%
3%
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flagAustralia
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10%
6%
74
flagPakistan
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6%
4%
48
flagthe United Arab Emirates
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0%
9%
33
flagGreece
55%
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5%
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18
flagthe United States
44%
37%
9%
5%
732
flagUnknown
38%
35%
17%
7%
39
flagCanada
54%
30%
10%
3%
66
flagNigeria
46%
30%
7%
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13