In compiling this list I realized there aren’t too many authors I buy faithfully. These are the happy few. In no particular order:

• Ernest Hemingway—I own five: A Farewell to Arms, For Whom the Bell Tolls, The Old Man and the Sea, The First Forty-Nine Stories, and On Writing. The Sun Also Rises is a priority to buy, and more of his nonfiction; I don’t think I’ll ever buy To Have and Have Not, which alone of his novels I didn’t enjoy in the least.
• Agatha Christie—too many to count, right off the top of my head.
• Rosemary Sutcliff—no surprises here.
• Timothy Zahn—I own most of his Star Wars novels and one standalone novel (The Icarus Hunt).
• J.R.R. Tolkien—multiple copies of The Hobbit, The Lord of the Rings, and The Silmarillion, and well-worn copies of Unfinished Tales and Letters; plus Sir Gawain and the Green Knight and The Children of Hurin. (Also owned: The Languages of Middle-Earth.)
• George Orwell—though not as many as I’d like.
• Homer—if we’re counting different translations of the same work.
• Stephen Ambrose
• Marguerite Henry—Admittedly I don’t read them much anymore, but her books were some of my favorites growing up, and I still have copies floating around.
• Anonymous—quite a few, actually.