Book Binding Dictionary
http://cool.conservation-us.org/don/dt/dt0412.html

Oxford Bibliographical Society
http://www.oxbibsoc.org.uk

Private Libraries Association
http://www.plabooks.org

Publishers Binding Online
http://bindings.lib.ua.edu/bib2.html

The Antiquarian Booksellers Association
http://www.aba.org.uk

The Bibliographical Society
http://www.bibsoc.org.uk

The International League of Antiquarian Booksellers
http://www.ilab.org