Juan de Valdés
Diálogo de la lengua.
Madrid: Espasa-Calpa, 1964. Clásicos Castellanos, 86. Edition and notes by José F. Montesinos. lxvi/228 pages.
Volume, measuring approximately 5" x 7.25", is bound in original printed wrappers. Book shows very light shelfwear. Binding is sound. Pages are clean and bright. 
Philological treatise, originally published in 1535, was the work of Spanish religious writer and Catholic reformer Juan de Valdés (1490-1541).