ESTIMATION OF THE FERTILITY LEVEL AND FARMLAND BALUE OF THE SOUTH-WEST PART OF ORYOL REGION. Science Outpost, [S. l.], v. 10, n. 4, p. 21–25, 2016. Disponível em: https://forpost-nauki.owebs.ru/article/view/4923. Acesso em: 28 sep. 2026.