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View of mobile laboratory made from luggage car on Central Railway of Peru (2)

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(Source: Barcroft J, Binger CA, Bock AV, et al. Observations upon the effect of high altitude on the physiological processes of the human body, carried out in the Peruvian Andes, chiefly at Cerro de Pasco. Philos Trans R Soc Lond B 1923;211:351-480. Public domain.)