Art researchers have always had difficulty identifying these initials and marks, but Castagno has made their jobs much easier.

Zentralblatt für Geologie und Paläontologie

... a basic resource for this special art reference field.

American Reference Books Annual

...essential to any art dealer, collector, and library or scholar.

The Antiquer's Guide

The work is accurate....more up to date than H.H. Caplan's...and Radway Jackson's...and it contains a larger number of difficult signatures....recommended for larger museum and research libraries.

Choice Reviews

...perhaps the most important signature directory ever published because it catalogues exactly those names that dealers, collectors, appraisers, and other experts have the most trouble deciphering.

Antiques and Collectibles