Exhibit 23
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation of our
report, dated January 28, 1999, included in this Form 10-K, into the Company's 
previously filed Registration Statements Files No. 333-58747, No. 333-48417, and
No. 333-48407.

Washington, D.C. 
March 16, 1999