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

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

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123. Lab notes on complement fixation experiments

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124. Letter from Michael Heidelberger to Linus Pauling

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

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126. Letter from Linus Pauling to Michael Heidelberger

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127. Letter from Linus Pauling to Michael Heidelberger

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128. Letter from Richard Willstatter to Michael Heidelberger

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

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

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

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

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

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134. Michael Heidelberger

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

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136. Letter from Kai O. Pedersen to Michael Heidelberger

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

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138. Letter from Richard Willstatter to Michael Heidelberger

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

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140. Letter from Michael Heidelberger to Hugh S. Taylor, Princeton University

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