John Castagno's Artists' Signatures and Monograms have become the standard reference source for galleries, museums, libraries, and collectors around the world. Whether used to identify, authenticate, or verify signatures and works of both well-known and little-known artists, Castagno's work has no equal. In this new volume, Castagno has collected the signatures and monograms of artists who have spent all or a part of their careers in abstract art—painters, printmakers, sculptors, and photographers worldwide. This book features approximately 2,300 artists with more than 3,900 signature examples of how they sign their works. In addition to the standard signature entries, the book contains sections for monograms and initials, common surname signatures, alternative surname signatures, symbols, and Cyrillic signatures. This book also lists an additional 1,500 artists whose entry bears no signature. All 3,800 artists are listed with the most updated information on nationality, birth, and/or death dates. The entries direct the researcher to many biographical and bibliographical sources not found on web site searches, and many of the resources offer additional references. Several individual listings provide gallery referrals and catalog auction dates, which can be used to buy or sell a particular artist's work. The use of Abstract Artists Signatures and Monograms: An International Directory provides the researcher a reference tool not duplicated elsewhere—one that will save many hours of research.