A Guide Book of Collectible – Hardcover, by Q. David Bowers; – Very Good
By Q. David Bowers; Mary L. Martin.
A Guide Book of Collectible Postcards Color Catalog 2020 – Q. David Bowers
David Bowers &Mary L. Martin Whitman Publishing. Authored byQ. Oversized hardcover format. Market values, rarity notes, and historical context.