THE PERFORMANCE OF MARGINAL GRAVEL MATERIALS USED FOR SURFACING GRAVEL ROADS: A CASE STUDY OF IRINGA REGION. The Tanzania Engineer - Journal of the Institution of Engineers Tanzania, [S. l.], v. 14, n. 1, p. 10–21, 2025. Disponível em: https://iet-journal.or.tz/index.php/ttejiet/article/view/1. Acesso em: 28 may. 2026.