Abadia de Montserrat, 1925. First Edition. 4to. 7 x 10.25 in. 402 pp. + index. Original plain aquatic blue printed wrappers. Profusely illustrated with black & white plates, facsimiles of Gregorian chant manuscripts, and with copious music examples in text; 5 large folding plates at rear. Extensive bibliographies. Errata slip.....