Includes bibliographical references (p. 246).

Vienna, Austria, National Library of Austria -- Admont, Austria, The Benedictine Abbey Library of Admont -- Ulm, Germany, The Monastic Libr ary at Wiblingen -- Metten, Germany, The Benedictine Abbey Library of M etten -- Wiemar, Germany, The Herzogin Anna Amalia Library -- Rome, Ita ly, The Vatican Library -- Florence, Italy, Riccardiana Library -- Pari s, France, The Mazarine Library -- Paris, France, The Institute Library -- France, Paris, The Senate Library -- Chantilly, France, The Cabinet des Livres of the Duc d'Aumale -- Saint Gall, Switzerland, The Abbey L ibrary of Saint Gall -- Oxford, England, Bodleian Library -- Cambridge , England, Wren Library, Trinity College -- Manchester, England, The Jo hn Rylands Library -- Dublin, Ireland, Trinity College Library -- Pragu e, The Czech Republic, The National Library -- San Lorenzo del Escorial , Spain, The Library of the Royal Monastery of El Escorial -- Mafra, Po rtugal, The National Palace Library in Mafra -- Boston, United States o f America, Boston Athenaeum -- Washington, D.C., United States of Ameri ca, The Library of Congress -- New York, United States of America, The New York Public Library -- Saint Petersburg, Russia, National Library o f Russia.