41. Michael Heidelberger arriving in Frankfurt, Germany, on his way to the Emil von Behring prizes award ceremony at Philipps University in Marburg, Germany

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42. Letter from A. M. Pappenheimer, Jr. to Alden H. Emery, American Chemical Society

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43. Letter from Michael Heidelberger to Alden H. Emery, American Chemical Society

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44. Letter from Michael Heidelberger to Alden H. Emery, American Chemical Society

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45. Michael Heidelberger

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46. Letter from Michael Heidelberger to Selman A. Waksman, Rutgers University Institute of Microbiology

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47. Letter from Baruj Benacerraf to Michael Heidelberger

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48. Letter from Georges Carlier, Embassy of Belgium to Michael Heidelberger

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49. Letter from Michael Heidelberger to W. Walcher, Philipps University

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50. Letter from W. Walcher, Philipps University to Michael Heidelberger

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51. Letter from M. V. Lakshminarayan Rao, Central Food Technological Research Institute (Mysore, India) to Michael Heidelberger

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52. Letter from Reginald M. Atwater, American Public Health Association to Michael Heidelberger

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53. The Public Health Research Institute of the City of New York, Inc

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54. Letter from Michael Heidelberger to C. W. Shilling, United States Department of the Navy

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55. Letter from Michael Heidelberger to his mother, Fannie Camp Heidelberger

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56. Michael Heidelberger with delegates at the Indian Science Congress in Calcutta, India

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57. Letter from Michael Heidelberger to the Editor of Industrial and Engineering News

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58. National Academy of Sciences Conference on Complement

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59. Michael Heidelberger delivering a lecture in Paris, France

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60. Participants at the National Academy of Sciences Conference on Complement

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