FrogWeb
Publishes guides and bibliographies for collectors of used, rare and antiqiarian books.

Studies in Bibliography
The online archives of the journal from the Bibliographical Society of the University of Virginia. Covers analytical bibliography, textual criticism, manuscript study, the history of printing and publishing, as well as related matters of method and evidence.

Descriptive Cataloging of Rare Books
A manual of rules for catalogers of the Library of Congress and others working with rare materials.

Violet Books: Bibliographies Index
Antiquarian supernatural literature including essays and a gallery of rare dust wrappers.

BelEdiMar
Listing of books printed in Belgium before 1801 based on catalogues by antiquarian booksellers and auctioneers.