2 nos. a year, June 1983- Four nos. a year, -Dec. 1981.
Note:
Title from cover. Imprint varies: Washington, D.C., <1979>-199 ; Alexandria, VA, <1993->. Description based on: May-Aug. 1979. Library retains latest edition only.
Special Numbering:
Suspended Dec. 1981-June 1983.
Reproduction Note:
Microfiche. [Washington, D.C.] : Supt. of Docs., U.S. G.P.O., [19__]- microfiches : negative : 11 x 15 cm.