Collection contains notebooks, correspondence, a large variety of writings, a diary, and some clippings. The correspondence largely involves his duties as editor but includes personal matters as well. Writings include entry lists for the Harper Encyclopedia of Science, essays, typescripts, articles for The World of Mathematics, book drafts, manuscript of Gd̲el's Proof, and other scientific writings. There are a large number of book reviews and articles, including some on atomic energy. Two manuscripts were written by his wife, Ruth (Gallert) Newman and there is a term paper by his daughter. The addition (8 volumes) contains notebooks that appear to hold notes from college courses. They include a transcribed lecture by Justice Felix Frankfurter. The 3 volume addition comprises spiral-bound volumes of photocopied author catalog cards for items in this collection.