@book{75047,
	author = {Esqueda Esquivel, Valentín Alberto.},
	title = {Control químico de la maleza en el cultivo de frijol en el centro de Veracruz},
	publisher = {INIFAP. Campo Experimental Cotaxtla,},
	year = {1992.},
	series = {Desplegable},
	address = {Veracruz, Ver. :}
}