I am asked this question more often than all the other questions put together.
Most Elder titles are not worth much money. They might be old, and they might be hard to find, but this does not necessarily make them valuable. What matters most is the book’s condition. Most Elder titles, even if they’re in excellent shape, sell on Ebay for about $20. If the book still has its dust jacket, the value will increase. If, on the other hand, the book is in poor condition, it might not sell at all.
A few Elder titles are particularly well-known and desirable, such as:
- anything in a special gift box, especially if it has kept the book in fine condition
- A Balloon Ascension at Midnight, Hall
- California The Beautiful, Elder
- Catalog Deluxe of the Panama-Pacific International Exposition, Trask & Laurvik
- The House That Jack Built, Hyde
- Old Spanish Missions of California, Elder
- The Palace of Fine Arts and Lagoon, Maybeck
- The Raven and The Philosophy of Composition, Poe
- The Simple Home, Keeler
- Wayfarers in Italy, Hooker
- Western Classics series
- Yosemite Legends, Smith
Some titles were issued in multiple editions, e.g. in an “ordinary” trade edition and a much fancier limited edition. Elder also issued a large amount of ephemera, much of which is now quite rare. Catalogs, particularly ones before 1912, and copies of his in-house magazine Impressions are also in demand.
Lastly, a note on terminology: to a bookseller, “good” condition is bad thing: only “poor” condition is worse. The scale from best to worst is: fine (sometimes “mint”), near fine, very good, good, fair, poor.