Listing 5,100 artists, with nearly 10,000 signatures, Castagno gives approximately 25% more information about artists' full names and birth and death dates than any other directory; lists nearly 1,000 artists overlooked by the American Art Annuals; and includes many important 19th-century artists and notable late 20th-century artists omitted in other indexed directories. With 600 listings of prominent Canadian and Latin American artists, and 900 listings of monograms, pseudonyms, symbols, etc. that would be unidentifiable without the use of the book.