The General Services Administration (GSA), established in 1949, is known as the federal government's "housekeeping agency." It manages public property and federal procurement. Its predecessor agencies include Office of Contract Settlement, Bureau of Federal Supply, Federal Works Agency, and War Assets Administration.
Government Documents has a partial collection of GSA publications, including the following series:
Federal acquisition regulation (GS 1.6/10:) FAR governs how federal agencies acquire supplies, equipment, and services.
Federal travel regulation (GS 1.6/8-2:) The FTR includes travel allowances and entitlements for federal employees, including per diem rates.
Federal management regulation (GS 1.6/8:) governs management of federal property.