The Neher papers are focused on cosmic-ray research, of which the bulk of the material is correspondence. The most extensive files relate to Robert A. Millikan and include original correspondence between Neher and Milikan, plus correspondence about Millikan in preparation for Neher's 1964 lecture for the American Association of Physics Teachers, "Millikan: Teacher and Friend." Additionally, some of MIllikan's own data and letters from Arthur H. Compton, Millikan's chief rival in the cosmic-ray field, are included. Of chief interest among the miscellaneous material are: sets of glass slides depicting experimental apparatus and expedition locations; three handwritten journals, beginning with Neher's trip to Australia and India in 1939-1940 in the company of Dr. and Mrs. Millikan and William Pickering, and continuing with two other journals covering multiple trips to Greenland, Europe, India, New Zeland, and eventually in his post-retirement period, to Russia and China (1983); and finally, Neher's 295-page autobiography, "Memories."