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A substantial amount of the correspondence in this section consists of form letters and newsletters sent to Friedländer by politicians seeking election to various public offices.

General research essentially covers all documents not dealing with Project Skyfire. Since Munitalp's purpose was to aid other organizations with their meteorological experiments, it had many different projects under its wing. Schaefer's papers in this area deal mainly with jet stream and cloud studies and weather modification. One specific example of a new weather modification experiment was Project Shower, which took Schaefer to Hawaii to work with the Pineapple Institute. Some of the files are reminiscent of his work at General Electric since his fascination with particle studies continued well beyond his days in the Knolls Research Laboratory. There are documents and photographs dealing with clouds, precipitation, and atmospheric particles, including some from Mount Washington since Schaefer continued to foster a working relationship with the lab there. Time lapse films of clouds and cloud formations were also a ground-breaking aspect of Schaefer's work with Munitalp.

This section includes some casual correspondence, as well as numerous letters from former students seeking letters of recommendation or advice from Friedländer.

Correspondence in this series centers around various topics or projects worked on by Friedländer. Included in this section are correspondences concerning the Eighth International Conference of Social Work in Munich, Germany, August 5-10, 1956, as well as his major textbook publications: Introduction to Social Welfare; Individualism & Social Welfare and Concepts and Methods of Social Work.

This section contains unidentified or miscellaneous letters, letters concerning his retirement from the University of California, Berkeley in 1959, and birthday congratulations, especially upon the occasions of his 75th, 85th and 93rd birthdays.

Just as Schaefer's best-known work at General Electric was Project Cirrus, one of his most important jobs with Munitalp was Project Skyfire. Schaefer became familiar with the problem of lightning-induced forest fires while he was still working at G.E., but it wasn't until he transferred to Munitalp that he could give the issue direct attention. Working alongside Harry Gisborne, chief of fire research in Missoula, Montana, Schaefer researched the use of cloud seeding techniques in changing patterns of lightning storms in the northwestern United States. This subseries contains the data, charts, maps, and photographs from this project.

Since Schaefer was Munitalp's director of research, and Munitalp participated in meteorological projects internationally as well as domestically, Schaefer was constantly in contact with associates all over the globe. The substantial amount of correspondence that he kept from his Munitalp years shows the greatly increased administrative role he held in comparison to his General Electric days.

The subject files feature a variety of materials that supplement Schaefer's Munitalp research documents, such as ephemera from some of his many travels, conference brochures, and weather research activities of groups not affiliated with Munitalp. This subseries also includes administrative files such as personnel information, grant writing endeavors, and budgeting, which are reflections of Schaefer's role as director of research. There are also photographs of Schaefer and colleagues, non-Skyfire research projects, travels in and out of the United States, and more generic subjects such as research equipment.

This subseries is devoted entirely to articles and reports from Schaefer's Munitalp years. Materials cover a range of topics including Project Skyfire, jet stream studies, cloud seeding, particle studies, and research on the relationship between environmental factors and the weather. Since this subseries is comparatively smaller than the reports and publications for General Electric, works by Schaefer and others are mixed together. The files are arranged chronologically, then alphabetically by article/report title if necessary. Folder titles note the author of each work. For Schaefer's writings, the archivist noted if there is a manuscript included with the published copy.