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Man observing the cathodic light spectrum
PHD26A04_288

Man observing the cathodic light spectrum

Lazzaro Spallanzani
PHD26A14_035

Lazzaro Spallanzani

Studies on diphteria in a laboratory
PHD26A04_071

Studies on diphteria in a laboratory

Croup vaccine by the Dr Roux
PHD26A05_201

Croup vaccine by the Dr Roux