The study was motivated by 2 concerns: (1) a large proportion of offenses that are committed both by juveniles and adults are never reported or officially recorded; and (2) without detailed information concerning the delinquent acts committed by non-Indian youths in the Wind River Reservation area of Wyoming it is impossible to ascertain whether or not the delinquency involvement of American Indian youths is high compared to other youths living in the same general area. Therefore, a self-report questionnaire on delinquent acts, alcohol use, and drug use was developed during the spring of 1972 and administered to 9th-12th grade students at Lander Valley High School and Wind River High School. The findings were based on a sample of 355 white males and 315 females; 68 Indian males and 62 females. There was little overall difference in the delinquency involvement of Indian and Anglo males--with the notable exception that Indians were more involved than Anglos in offenses centering around the school. Compared to Anglos, a significantly higher portion of both male and female Indian youths had doubts about whether or not they would complete high school, did not plan to attend college, felt that they were not as smart as their peers, received lower grades in school, and had dropped out of school. With respect to illegal drug use, a higher porportion of Indian than Anglo males had used drugs, other than marijuana, and a higher proportion of Indian than Anglo females had smoked marijuana. The fequency of various delinquent acts were presented in tabular form. (FF)