Supplementary materials for unit 10 of the bilingual social science strand developed for grade three are designed to help the teacher carry out learning and assessment activities which focus on communities around the world. A timetable for when these materials are to be used is found in the teacher's guide for unit kits 37-40. Illustrations are to help stimulate oral language and conceptual development; and, there are ditto masters of worksheets for individual seatwork by students. The worksheets are to be presented under supervision rather than as independent tasks. Instructional aids included here are maps of Cuba, Mexico, and Puerto Rico; visuals for use with the story of the explorer Balboa; and worksheets on maps, cultural background, Balboa's life, natural resources of the countries, and elements of culture. All classroom materials are in Spanish. (RS)