Original dark blue cloth on boards. An exhaustive individual study of four large libraries in Paris, the British Museum, the Bodleian Library, the Cambridge University Library, and American libraries at Austin, Texas, and Pasadena, California. List of Illustrations, Introduction, Bibliography, Abbreviations, List of Liturgical Music Incunabula, Chronological List, Index of Printers, and Index of Places. No writing or damage. 63 pp.