This study examined 15 secondary American history textbooks to evaluate their accuracy in depicting Native Americans as a follow-up to studies by Costo and Henry (1970) and Loewen (1995). The criteria embodied an authenticity guideline based upon the Five Great Values with a rating scale between 1 (lowest) and 5 (highest). The results indicate that only three of the textbooks rated above average. Though generally the textbooks have improved in quantity of cultural information, better treatments must be pursued that reflect more accurate and comprehensive accounts. The challenge lies in assisting educators' acquisition of knowledge and familiarity with Native cultures as they are depicted in textbooks, an endeavor that will further assist these teachers in adopting and utilizing proper textbooks. (Contains 1 note.) [The following are appended: (1) The Five Great Values Authenticity Guideline; and (2) Textbook Data and Authenticity Ratings.]