- 50 Klassikern der Soziologie
- Albert Einstein archives
- Austrian National Library, Vienna, Austria
- Bad Schussenried Bibliothekssaal, Baden-Württemberg, Germany
- Beinecke Library, Yale, New Haven, E. U.
- Biblioteca Alexandrina
- Biblioteca Ambrosiana de Milán
- Biblioteca Angelica, Rome, Italy
- Biblioteca Castilla La Mancha, Spain
- Biblioteca Cervantes Virtual
- Biblioteca de la Abadía de Silos, Burgos, España
- Biblioteca de la Real Academia Española de la Lengua, Madrid
- Biblioteca del Estado Ruso
- Biblioteca del Senado de España
- Biblioteca Di Belle Arti, Milan, Italy
- Biblioteca do Palacio e Convento de Mafra I, Lisbon Coast, Portugal
- Biblioteca do Palacio Nacional da Ajuda Lisboa III, Lisbon, Portugal
- Biblioteca General Histórica de la Universidad de Salamanca, España
- Biblioteca Geral University of Coimbra, Coimbra, Portugal
- Biblioteca Joanina
- Biblioteca Medicea-Laurenziana, Florence, Italy
- Biblioteca Mediceo Laurenziana, Florencia
- Biblioteca Nacional de España, Madrid, España
- Biblioteca Nacional Rusa, San Petersburgo
- Biblioteca Palafoxiana, Puebla, Mexico
- Biblioteca virtual Madrid
- Bibliotheca Augustana
- Bibliotheque Alencon, Normandy, France
- Bibliothéque Nationale de France, Paris, France
- Bibliotheque Sainte Genevieve, Sorbona, Paris
- Bibliotheque Solvay, Brussels, Belgium
- Boston Athenæum, Boston, MA, USA
- Boston Copley Public Library, Boston, USA
- British Museum, Reading Room, Londres
- Cambridge University Library, Cambridge, R. U.
- Casanatense Library, Rome, Italy
- Cathedral Library, Kalocsa, Hungary
- Chetham's Library, Manchester, UK
- Codrington Library, All Souls College, Oxford, England
- Colegio de Brujas
- Colegio de México
- Cornell Law School Library, Ithaca, NY, USA
- Dartmouth College
- Darwin online
- Duke of Humphrey's Library, Bodleian, Oxford University, England
- Dutch Royal Archives Library, Netherlands
- El Escorial Library, San Lorenzo, Spain
- Folger Shakespeare Library, Washington D.C., USA
- Frederick Ferris Thompson Memorial Library, Vassar College,
- Fürstabtei Sankt Gallen Bibliotek , Lago Constanza, Suiza
- George Peabody Library, Baltimore, Maryland, USA
- Handelingenkamer Tweede Kamer Der Staten-Generaal Den Haag, the Hague, Netherlands
- Harper Library, The University of Chicago, IL, USA
- Harvard Libraries. Cambridge, Mass. E. U.
- Hereford Cathedral Chained Library, Hereford, England (Rare books were once kept chained to the bookshelf to prevent stealing.)
- Herzogin Anna Amalia Bibliothek Weimar II, Germany
- John Rylands Library, Manchester, England (Thanks to Edward Brownrigg and John Rylands)
- Johns Hopkins U. George Peabody Library
- Klementinum Library, Prague, Czech Republic
- Kremsmuenster Abbey Library, Kremsmünster, Upper Austria.
- La Biblioteca Nacional de China, Beijing
- Law Library, Iowa State Legislature, IA, USA
- Library of Congress of the United States of America, Washington
- Library of Congress, Washington, DC, USA
- Library of Parliament, Ottawa, Canada
- Library of St. Walburga, Zutphen, Netherland (Preserved from the 16th century)
- Library of the Benedictine Monastery of Admont, Austria
- Library of the National Palace of Mafra, Portugal
- Library of the Prussian King Frederick the Second in Potsdam, Germany
- Library of the University of Oxford
- Lisboa
- Llyfrgell Genedlaethol Cymru, National Library of Wales, Aberystwyth, Wales
- Magdalene College Library, Cambridge
- Marxists Internet Archive
- Max Planck
- Nacional Clementinum, Praga
- Nacional de Alemania
- National Art Library, Victoria and Albert Museum, London
- National Library of Ireland, Dublin, Ireland
- New Haven, Connecticut, E. U.
- New York Public Library, New York, USA
- Newton Papers
- North Reading Room, UC Berkeley, California, USA (Terrific reader suggestion)
- Old British Reading Room, British Museum, London, England
- Old Chicago Public Library (Current Cultural Center), Chicago, IL, USA
- Open Library
- Pierpont Morgan Library, NY, USA
- Plantin-Moretus, Antwerp, Belgium
- Poughkeepsie, New York, USA
- Praga, Monasterio Strahov, Sala teológica
- Princeton University Libraries, Princeton, New Jersey, E. U.
- Queen's College Library Oxford
- Real Biblioteca de El Escorial, Madrid
- Real Gabinete Portugues De Leitura Rio De Janeiro, Brazil (Possibly the most beautiful library of them all.)
- Rennie Mackintosh Library, Glasgow School of Art, Scotland (Added on excellent reader suggestion.)
- Riggs Library, Georgetown University, USA
- Rijksmuseum Library, Amsterdam
- Riksdagen Library, Swedish Parliament Library, Stockholm, Sweden
- Royal Society of London for Improving Natural Knowledge, Library of the
- Russian National Library, St. Petersburg
- Salamanca Library, Salamanca, Spain
- Saxon State Library in Dresden, Germany (The reading room pictured is entirely underground, the ceiling being level with the grass.)
- Sorbonne Library, Paris, France
- St. Florian Monastery-Library, Austria
- State Library, Victoria, Australia
- Sterling Memorial Library, Yale, New Haven, Connecticut, USA (The rest of Sterling Library is incredible, but I particularly enjoy that wonderful library specialty, the card catalog)
- Stift Melk Bibliothek, Abadía de Melk, Austria
- Stiftsbibliothek Klosterneuburg, Klosterneuburg, Austria
- Suzzallo Library, Seattle, Washington, USA
- The British Library, Londres
- The Grolier Club Library, NY, NY, USA
- The New Library of the Royal College of Physicians of Edinburgh
- The St. Johnsbury Athenaeum, Northeast Vermont, USA
- Thomas Crane Library, Quincy MA, USA
- Thomas Fisher Rare Book Library, Toronto, Canada
- Trinity College LIbrary, AKA, The Long Room, Dublin, Ireland
- Trinity College Library, Dublín
- UC Berkeley Library
- UNAM
- Univ. de Heidelberg
- University of Michigan (Old) Law Library, MI, USA
- University-Library, Helsinki, Finland
- Vaticano: La Santa Sede, Roma
- Viena
- Waldsassen Abbey Library, Bavaria, Germany
- Widener Library, Harvard. Cambridge, MA, USA
- Wren Library, Trinity College, Cambridge, England
- Yale University Libraries, New Haven, Connecticut, E. U.
Webmaster: Pablo de Gracia Soriano
