@book{4503, author = {Palacios Alberti, Jesús and Rodríguez Alonso, Mariano and Castilla y León}, title = {Guía de la reserva de "Las Lagunas de Villafáfila" }, publisher = {: Junta de Castilla y León}, year = {, D.L. 1993}, address = {Valladolid } }