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This subseries is comprised of various research data retained by Schaefer that were not filed specifically with cloud seeding or ice and snow research. These are the notes, graphs, drawings, and photographs of experiments that supported later discoveries in his larger projects. Notes and photos in this subseries include subjects such as surface tension, monomolecular layers, smoke generation, fog, uses of calgon, and electron microscopy. Also of note are his observations on precipitation and precipitation static, which he worked on with Irving Langmuir during World War II. While the bulk of the notes are Schaefer's own, there are also papers that belonged to Langmuir and various other scientists who shared observations with Schaefer.