Bogen's manuscripts were kept with original numbering by Bogen, and as much of the original order as possible when received. Some manuscripts are numbered with a stamp, some with handwritten numbers, and some with both. There are both reprints and manuscripts, the latter often with significant handwritten corrections and revisions. The manuscripts and reprints from many sources, including Bogen himself and his daughter, and continued after his death. The office files also include correspondence, unnumbered manuscripts, and an index of Bogen's writings. One index has annotations by Bogen. There is also an index of published works by Bogen's colleagues and associates, including Seymour Froman and Jane Skillen. All of the indices are in box 66. The work by Bogen's associates is numbered with the letter "A" before the number, writings between A5 and A90 are included in this sub-series. As for Bogen's writings, numbers between 19 and 1023, are included. For the most part, they are consecutive, but some are missing. Many of Emil Bogen's papers are also held at the Huntington Library.