Vols. for 1973- issued in 2 or more parts; for 1980- issued in 2 parts, including vol. for current agencies (published annually) and vol. for non-current agencies (published quinquennially).
Edition for 1981 published in microfiche only.
Notes
Published: Manassas, Va., <1999->
Editor: 1973- J.L. Andriot ; <1999->, Donna Andriot.