by United States. General Accounting Office
Cover title.
Distributed to depository libraries in microfiche.
Shipping list no.: 92-1147-M.
"October 1991."
"GAO/NSIAD-92-25."
"B-245437"--P. 1.
Microfiche. [Washington, D.C.] : U.S. General Accounting Office, [1992?] 1 microfiche : negative.