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Determination of the total respiratory exchange while walking on the highest portion of the 1-in-4 grade on the cog railway from the 1911 Anglo-American Expedition to Pikes Peak

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C Gordon Douglas is shown breathing into a "Douglas bag." (Source: Douglas CG, Haldane JS, Henderson Y, Schneider EC. Physiological observations made on Pike's Peak, Colorado, with special reference to adaptation to low barometric pressures. Philosophical Transactions of the Royal Society, Series A 1913;203:185-318.)