[Santiago] Chile: Universidad de Chile, Instituto de Investigaciones Musicales, n.d., late 1950s. Pamphlet. 41p., has several b&w photoillustrations, diagrams and music notation, softbound pamphlet in 9x6 inch stapled decorated wraps; mild dust-soil and irregular toning, one corner-tip slightly bent, a good copy. Coleccion de Ensayos no. 12.