A partial list follows… from https://www.artofmanliness.com/living/reading/libraries-famous-men-louis-lamour/

The Annals and Antiquities of Rajahstan by James Tod — “a source for several planned books”
Ralph Waldo Emerson’s essays
Treasure Island by Robert Louis Stevenson — “one of the first books I read”
History of the World — he doesn’t mention the author, so I’m not exactly sure which book this is, but his memory of it was too good to pass up: “when my father came home I would sit on his knee and tell him what I read during the day.”
Black Beauty by Anna Sewell
“A dozen Horatio Alger novels”
A Princess of Mars by Edgar Rice Burroughs
Ivanhoe by Sir Walter Scott
Ben-Hur by Lew Wallace
The Count of Monte Cristo and The Three Musketeers by Alexander Dumas — “It was a great day when I discovered on the shelves of the library a set of forty-eight volumes by Dumas, and I read them, every one.”
Les Miserables, The Hunchback of Notre Dame, The Man Who Laughs, and Toilers of the Sea by Victor Hugo — “The last-named was my favorite.”
Leatherstocking Tales (a series of 5 novels) by James Fenimore Cooper — “Enjoyed them.”
The Bar Sinister by Richard Harding Davis — “a story about a dog, and a good yarn.”
Martin Eden by Jack London — “prepared me for the rejections to come, and the difficulty I would have in getting published.” Also by London: The Sea Wolf, The Call of the Wild (“another great dog story”)
The White Company by Arthur Conan Doyle — “an exciting, romantic story.”
The Adventures of Gil Blas by Alain Rene Lesage — “I read it not once but twice on the plains of West Texas.”
Don Quixote by Miguel de Cervantes — “marvelous stuff.”
Hamlet by Shakespeare — “ was the ultimate professional, a writer who knew what he was doing all the time.”
The Odyssey and The Iliad by Homer — “I often thought how like some of his characters were men whom I had met.”
The Life of Samuel Johnson by James Boswell — “without doubt one of the greatest biographies in the English language. It was a book I read slowly, often returning to reread parts of it.”
Lord Jim by Joseph Conrad — “I have read several times . . . and which for me was a real discovery.”
Ecce Homo, The Birth of Tragedy, Thus Spake Zarathustra, and The Will to Power by Friedrich Nietzsche
Crime and Punishment by Fyodor Dostoyevsky — “surprised by this book — surprised and very impressed. Several times I turned back to reread sections of the book.”
Kim by Rudyard Kipling — “read it twice.”
Candide by Voltaire — “it was a revelation. I loved it, rereading it at once.”
Commerce of the Prairies by Gregg — “one of the basic books of the westward movement”
My Life on the Plains by George Custer
The Art of War by Sun Tzu, The Military Institutions of the Romans by Vegetius, On War by Carl von Clausewitz — “military tactics had interested me since my youth”
The Case of Sergeant Grischa by Arnold Zweig — “the best novel to come out of World War I, although Remarque’s All Quiet on the Western Front attracted more attention and was a good book also.”
Lives by Plutarch — “In several of my western novels I have had characters reading Plutarch. I believe more great men have read his Lives than any other book, except possibly the Bible. … In reviewing the reading histories or libraries of great men, I have come upon him again and again, and justly so. His is a sophisticated, urbane mind dealing with aspects of leadership.”
The Prince by Niccolo Machiavelli
The Red and the Black by Stendhal
Wuthering Heights by Emily Bronte
Walden by Henry David Thoreau
To Have and Have Not by Ernest Hemingway, also his story “Fifty Grand” — “one of the best fight stories every written. Jack London’s ‘The Mexican’ is another.” L’Amour wrote that he “enjoyed Hemingway’s short stories more than his novels.”
Historic Sketches of the Cattle Trade by Joseph McCoy — “an excellent book and one of the basic books on that aspect of the west. J. Frank Dobie’s The Longhorns is another.”
The Log of a Cowboy by Andy Adams
The Life of Billy Dixon by Olive Dixon — “I managed to stay awake most of the night to finish the story . . . Recently I reread the book and found it every bit as good as I had remembered.”
Six Years With the Texas Rangers by James Gillett
The Koran — “I find it has much to offer”
Journal of a Novel by John Steinbeck
The Decline of the West by Oswald Spengler

"We don't have any law here. Just a graveyard." LL from TREASURE MOUNTAIN