SMITH, Elwin G; YOUNG, Douglas L. The Economic and Environmental Revolution in Semi-arid Cropping in North America . Annals of Arid Zone, India, v. 39, n. 3, 2016. DOI: 10.56093/aaz.v39i3.65877. Disponível em: https://epubs.icar.org.in/index.php/AAZ/article/view/65877. Acesso em: 3 nov. 2025.