Aboveground biomass and volume equations for Pinus halepensis Mill., in Coahuila, Mexico Dahkkit: Montoya Jiménez, Juan C., Méndez González, Jorge, Sosa Díaz, Librado, Ruíz González, Cecilia G., Zermeño González, Alejandro, Nájera Luna, Juan A., Manzano Camarillo, Mario G., Velázquez Rodríguez, Alma S.