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3. Brues, A. M., to M. Murray. 5 March 1948. Porter Papers, Colorado. Box CM 18.
4. Burnett, H. A., to K. R. Porter. 29 April 1949. TCA Papers. Box 1, Folder 21.
5. Carrel, A.; Burrows, M. T. Cultivation of tissues in vitro and its technique. J. Exp. Med. 13:387–396; 1911.