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PHD26A12_314
The periscope
PHD26A04_288
Man observing the cathodic light spectrum
PHD26A13_142
Astronome en observation
PHD26A14_056
Tidal bore on the Seine river in Paris, France
PHD26A05_232
Fridtjof Nansen
PHD26A05_233
Fridtjof Nansen
PHD26A13_458
Observation by the telescope
PHD26A03_246