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Exhibit 23
CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
As independent public accountants, we hereby consent to the incorporation of
our reports included in this Form 10-K, into the Company's previously filed
Post-Effective Amendment No. 6 to the Form S-8 Registration Statement File No.
2-69991, into the Company's previously filed Post-Effective Amendment No. 4 to
the Form S-8 Registration Statement File No. 2-66025, into the Company's
previously filed S-8 Registration Statement File No. 33-37366, into the
Company's previously filed Form S-8 Registration Statement File No. 33-37367,
into the Company's previously filed Form S-8 Registration Statement File 333-
16725, into the Company's previously filed Form S-8 Registration Statement File
No. 333-28839, and into the Company's previously filed Post Effective Amendment
No. 1 to the Form S-3 Registration Statement File No. 333-39559.
ARTHUR ANDERSEN LLP
Dallas, Texas
September 6, 2000
