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32. Men working in the Parasitology Research Laboratory]
33. [Bottling liquid plasma]
34. [Laboratory with three men in uniform]
35. [Bacteriological Laboratory]
36. [Men and test tubes]
37. [Laboratory technician examining a dead rat, New Orleans, La.]
38. Staff of the Laboratory of Biologics Control
39. [Enzyme studies in a laboratory of the Department of Biochemistry at Duke University]
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