I recently picked up a very nice copy of the second printing of The Emerald City of Oz, originally published in 1910. The second printing is marked by a new, simplified cover design which was based on the endpapers of Dorothy and the Wizard in Oz. Otherwise, the physical aspects of the book remain the same as the first printing.
The Emerald City was an elaborately produced book, with the fanciful addition of metallic ink in the 16 color plates. An interesting point in this second printing is a change in the quality of the metallic green ink.After this printing, the metallic ink was dropped from the book's production.
The original cover design also used metallic green ink, as well as metallic silver. The elaborate cover was produced in both a dark blue and a light blue binding. As can be seen below, the new cover is quite a step back from the active, bustling original cover design!