This series has been divided into sub-series according to the original arrangement of materials:

Sub-Series A. "S" series of files, chiefly reprints of articles, includes reprints of articles by others that were identified as "S" series by Herrick. These articles and papers are on topics such as comets, grid navigation, orbits, and advancements in the field of astrodynamics. The files are numbered sequentially, maintaining the original order, and there are a number of folders with an "S" number, but no title.

Sub-Series B. Article Reprints, includes reprints of articles and technical papers by others. These files are organized alphabetically by author name and include topics such as celestial mechanics, orbits, and the space sciences.

Sub-Series C. SH Publications, consists of notes, drafts, and revisions of Herrick's Astrodynamics. It also includes errata, vellums, research reports, and bibliography materials.

Sub-Series D. SH Numbered Publications (see also listing in Box 1), is made up of Herrick's publications numbers 1 through 233. They are numbered in accordance with his bibliography (located in Box 1) and include drafts and reprints of his work, as well as correspondence relating to it. Topics include orbit methods, comet observations, position determination, celestial navigation, planetary grids, ephemeris of minor planets and objects, rocket trajectories, space travel, lunar exploration, astronomical values, and advancements in astrodynamics.

Sub-Series E. Drafts of Articles and Book Chapters, includes additional notes and drafts of articles and book chapters, such as Herrick's Contribution to CRC "Handbook of Tables for Mathematics," 1965-1966, Gibb's Contribution to Orbit Theory, and Herrick's review of Einstein books. It also contains correspondence related to Herrick's drafts and publications.