Influence of Agricultural Extension Contact on Control of Farmland Degradation among Yam Farmers in Delta North Agricultural Zone of Delta State, Nigeria. Mediterranean Journal of Social Sciences, [S. l.], v. 5, n. 2, p. 33, 2014. Disponível em: https://www.richtmann.org/journal/index.php/mjss/article/view/1956.. Acesso em: 5 may. 2024.