In a cooperative task, American Indian elementary students produced bilingual natural history dictionaries using a Macintosh computer. Students in grades 3 through 8 attended weekly, multi-graded bilingual classes in Hupa/English or Yurok/English, held at two public school field sites for training elementary teaching-credential candidates. Teams of three students worked together at the computer to complete a dictionary page, a task involving selection of a natural item, formulation of its definition, transcription in the Unifon alphabet, translation to English, and page layout. The project focused on written sentence construction and oral communication skills. The goal of producing a dictionary dealing with plants and animals known to local tribes allowed students to use knowledge obtained from family and other tribal members. The computer provided concrete realization of abstract concepts and a self-directed interactive learning environment. Classroom observation showed that (1) students worked on the project willingly for the entire school year; (2) students' oral communication skills, used in the cooperative learning groups, developed over the year; (3) students tended to build on the work of other students; (4) older and younger students differed in their ways of viewing the natural world; and (5) older students advanced from producing literal English translations to making "good" free translations. The success of this project points to the importance of implementing a teaching methodology compatible with the learning style of the home culture. This report contains 26 references. (SV)