The Abraham L. Brearcliffe Jr. Collection is comprised of materials collected by Brearcliffe, Jr. during his time at the Boeing Company. Although Brearcliffe worked at Boeing from 1930-1945, the materials in this collection are almost exclusively from the war years (1941-1945).

Series I. Unions is comprised of labor union membership materials, primarily for the Sheet Metal Worker's International Association and the International Association of Machinists, including identification cards and dues receipts. There is also a leather wallet which holds identification cards and receipts from the Sheet Metal Workers' International Association.

Series II. World War II consists of a small amount of personal materials related to living on the Home Front during World War II, including ration coupons for sugar, gasoline, and liquor as well as tire inspection records and mileage tickets, selective service cards, and two booklets, including one on how to grow a victory garden and one with air raid instructions. There are also assorted tips for successful supervising and job training. Additionally, there is a 1936 booklet by Benjamin Franklin titled To a Young Man--On How to Choose a Mistress, which was found with the supervising and job training materials. Although unrelated to the rest of the collection, it has been retained to give a clearer picture of Brearcliffe's character and sense of humor.

Series III. Boeing is comprised of materials specifically related to Boeing Aircraft Company employees, including work assignments, a November 1941Manual for Employees, and several booklets, including one that outlines social activities and classes for female workers and one with information on Boeing'sInvention Incentive Plan. There are also two telephone directories; a 1940 report by Walter L. Sundstrom, Report of Foreman Training Conference: Held with the Foreman of the Boeing Aircraft Company, Seattle, Washington; and a small amount of technical drawings and work instructions, including a thin metal sheet which may have been used to measure rivets and two work flow diagrams. Additionally, Brearcliffe's foreman's binder, which includes payroll forms, inter-departmental memos, work orders, staff rosters, and letters to staff members, is also included.

Following the textual materials related to Boeing there are eight black-and-white photographs depicting the Boeing B17F and Boeing B17G Flying Fortress. The aircraft is shown in flight, including in formation, and on the ground. Five of the images include a stamp on the reverse "Official Air Force Photograph, Nov 1944, Army Air Field, Alexandria, LA" while two of the images have the same stamp, except are marked as "Dec 1944". One image has no stamp.

At the end of the collection are seven clippings, mostly from unidentified publications, with topics including Boeing history and the Museum of Flight's acquisition of the Red Barn. Identified publications include The Seattle Times and The News Tribune [Tacoma, Washington]. Some of the clippings were annotated by Brearcliffe, Jr. Additionally, the collection has three (3) issues of Boeing News and two (2) issues ofContact!, a newsletter delivered to aviation workers during World War II, including the February 5, 1942 edition which mentions Brearcliffe, Jr. on the cover page.