81. Letter from Michael Heidelberger to Charles D. Hurd, Northwestern University

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82. Letter from Richard Willstatter to Michael Heidelberger

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83. Letter from Charles D. Hurd, Northwestern University to Michael Heidelberger

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84. Letter from Kai O. Pedersen to Michael Heidelberger

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85. Letter from Michael Heidelberger to E. J. Crane, Chemical Abstracts

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86. Michael Heidelberger in his Columbia University College of Physicians and Surgeons office

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87. Michael Heidelberger

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88. Letter from Geddes Smith, Commonwealth Fund to Michael Heidelberger

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89. Letter from Michael Heidelberger to Geddes Smith, Commonwealth Fund

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90. Letter from Charles A. Doan, Ohio State University to Michael Heidelberger

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91. Letter from Michael Heidelberger to Charles A. Doan, Ohio State University

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92. Letter from Richard Willstatter to Michael Heidelberger

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93. Letter from Linus Pauling to Michael Heidelberger

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94. Letter from John R. Marrack, London Hospital, Hale Clinical Laboratory to Michael Heidelberger

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95. Letter from Linus Pauling to Michael Heidelberger

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96. Letter from Michael Heidelberger to Linus Pauling

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97. Lab notes on complement fixation experiments

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98. Letter from A. M. Pappenheimer, Jr., University of Pennsylvania School of Medicine to Michael Heidelberger

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99. Letter from Michael Heidelberger to A. M. Pappenheimer, Jr., University of Pennsylvania School of Medicine

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100. Letter from William C. Boyd, Boston University to Michael Heidelberger

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