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/A Amendment No. 1, into the Company's previously filed Registration Statements File No. 33-61697, File No. 33-63199, File No. 33-80660 and File No. 33-84502. /s/ ARTHUR ANDERSEN LLP ---------------------- ARTHUR ANDERSEN LLP Albuquerque, New Mexico September 23, 1997