Ralph L. Angell papers, MC 41. Institute Archives and Special Collections, Rensselaer Polytechnic Institute, Troy, NY.
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Ralph L. Angell papers, MC 41. Institute Archives and Special Collections, Rensselaer Polytechnic Institute, Troy, NY. https://guides.archives.rpi.edu/repositories/2/resources/119 Accessed May 05, 2024.