The Ruth K. (Pellinen) Petrich Photograph Collection is a small collection consisting of 21 photographs and two clippings related to Petrich's time working at the Boeing Company as an assistant to test pilots during World War II.

Petrich's wartime work for Boeing primarily consisted of packing parachutes and preparing gear for the company test pilots, and this work is documented through the photographs and clippings. The photographs include black-and-white official Boeing photos, color snapshots, and black-and-white portraits, ranging in size from 2.25x3 inches to 8x10 inches. Pictured scenes include Petrich suited up for a B-17 ride; Petrich suiting up a female reporter for a flight; Petrich with fellow women workers; and Petrich driving a cart used for transporting materials across Boeing's campus. There are also images with scenes and informal portraits of Boeing B-17 and B-29 flight test pilots and crews, including a portrait of Elliott Merrill inscribed to Petrich. Additionally, there are informal and formal portraits of Petrich, as well as one of her husband, Keith T. Petrich, who was a pilot for Pan American Airways. An image of Petrich with ground crew of the B-17F "Hell's Angels" on a publicity tour is accompanied by a clipping. One additional clipping is an obituary for test pilot Robert (Bob) T. Lamson.