The report opens with detailed summaries of historical background information for each of the groups involved and with a review of the literature on bias in textbooks in Canada, the United States, and other countries. Over a time span of six months, 211 readers evaluated 1,719 textbooks. Readers located 104 biases in 78 textbooks. The 23 biases against the aged occurred mainly in English primary texts. Bias by omission accounted for most of the 65 findings concerning labor unions; however, strong negative statements about unions constituted most of the other biases. The 16 biases against political minorities were mostly ones of omission. The investigators believed that biases against labor unions could have a strong negative effect on student attitudes. Biases regarding the aged and political minorities, on the other hand, were not considered pronounced enough to negatively affect student attitudes. The investigators recommended objective balanced treatment of minority groups in textbooks, and the formulation of guidelines for textbook evaluation. Seven appendixes include the evaluation instrument; related biases against the French, Indians, other ethnic minorities, and women; suggestions for improving the evaluation instrument; and lists of texts containing bias. (JR)