Book excerpt: John Castagno's Artists' Signatures and Monograms have become the standard reference source for galleries, museums, libraries, and collectors around the world. European Artists III: Signatures and Monograms From 1800, A Directory features an additional 2,800 artists and signatures. In addition to the standard signature entries, the book features sections for monograms and initials, common surname signatures, alternative surname signatures, and illegible signatures. It provides the researcher a reference tool not duplicated elsewhere—one that will save many hours of research.