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                                                                    EXHIBIT 23.1

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the incorporation of
our report included in this Form 10-K into the Company's previously filed
Registration Statements on Form S-8 (SEC File No. 33-48270 and SEC File 
No. 33-33190).

                                       /s/ ARTHUR ANDERSEN LLP

San Antonio, Texas
March 24, 1998