Dr. Calhoun and his colleagues are seated at a counter that surrounds the mouse universe, several feet off the floor of the enclosure. Dr. Calhoun has a pen in his left hand and an open notebook in front of him.

John B. Calhoun papers, 1909-1996
Archives and Modern Manuscripts Collection, History of Medicine Division, National Library of Medicine, Bethesda, MD; MS C 586.

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