The Harold W. Zipp Collection documents Zipp's career at The Boeing Company in both Wichita, Kansas and Seattle, Washington with documents and photographs. The bulk of the collection relates to Zipp's tenure in Wichita before his transfer to Boeing in Seattle in 1952.

Series I. Textual materials includes logbooks, diaries, newspaper clippings, illustrations, engineering drawings, brochures, membership certificates, speech transcripts, and business and personal correspondence. His diaries, which make up the bulk of the series, are primarily in the form of datebooks and include both details from his professional and personal life spanning the 1940s and early 1950s. Of special note are his discussions of aircraft, development of new aircraft, notable cross country flights, airplane crashes, and issues relating to the atomic bomb.

Series II. Photographs includes 236 prints related to his career. The bulk of the images are black-and-white professional prints, most being official Stearman Company or Boeing company photographs. The images include group portraits of Zipp and his colleagues, posed images of men at desks and in meetings, pinning ceremonies, and views of aircraft, especially Stearman models. Most of the images have no identifications or contextual information, though staff have identified Zipp and some of his colleagues, such as Julius E. Schaeffer. There are some loose scrapbook pages which include a mix of professional and snapshot-type images as well as a few pieces of printed ephemera. It is unclear who disassembled the scrapbook or when.