Winternitz, M. C. (Milton C.). “Fig. 5: Emphysema and Congestion in Lower Lobe of Dog Dying 24 Hours after Exposure. Fig. 6: Slight Edema and Emphysema in Upper Lobe of Dog Dying 52 Hours after Exposure.” Collected Studies on the Pathology of War Gas Poisoning. New Haven, Connecticut: Yale University Press, 1920. https://digital.sciencehistory.org/works/dj52w485x.