... a detailed and highly informative catalogue by a distinguished palaeographer. It has been elegantly produced, with carefully selected plates, to supplement a text which is both clear and well laid out, and is exactly what readers would look for in a modern catalogue of medieval manuscripts. Medium Avum Professor Hanna shows at every turn his meticulous concern for the details without slighting the larger framework of the individual description or the architecture of a unified catalogue. This is an impressive achievement, a labor of love. Thomas M. Izbicki, Johns Hopkins University In its overall detail and accuracy the volume is a testimony to the quality of ... scholarship. A. S. G. Edwards, Times Literary Supplement