For the health of the land : previously unpublished essays and other writings - Leopold, Aldo 1886-1948; Callicott, John Baird 1941-; Freyfogle, Eric T.; Sanders, Scott Russell; Temple, Santley A; Rorer, Abigail (Washington, D.C. : Island, 1999)
Keywords: CONSERVACION DE LA NATURALEZA; PROTECCION DEL MEDIO AMBIENTE; FAUNA; CONSERVACION