The Advertising Conference by The Goswogii by Richard Henry Little and illustrated by Ervine Metzl was published in 1927. While there was a reprint of the original, the book is something of a mystery. Ervine Metzl is not.
With books migrating to pads and pods this maybe a moot point. But before designed book jackets, book covers were the primary illustrative and typographical surface on a book. The photographs of the covers taken from “Arts and Crafts Book Covers” (in the book over 90 in all), makes this an essential document of a fertile creative period.