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Schaefer's correspondence files are arranged alphabetically by subject. They include letters sent and received by Schaefer as well as some to and from Irving Langmuir. Schaefer also retained letters that were to and from others at General Electric but carbon copied to him. While most of Schaefer's letters came to the archives grouped in large, general batches, some were retained separate from the larger groups. The archivist kept that arrangement, which is why certain letters are foldered individually or in very small groups while the majority of this subseries is simply categorized as "general".