Harold Shea (with L Sprague de Camp)
1. The Incomplete Enchanter (1941)
2. The Castle of Iron (1941)
3. Wall of Serpents (1953)
     aka The Enchanter Compleated
The Compleat Enchanter (1975)
The Intrepid Enchanter (1988)
The Complete Compleat Enchanter (1989)

Land of Unreason (1942) (with L Sprague de Camp)
The Well of the Unicorn (1948) (writing as George W Fletcher)
The Carnelian Cube (1948) (with L Sprague de Camp)
The Blue Star (1952)
The Undying Fire (1953)
     aka The Conditioned Captain
Invaders from Rigel (1960)
Alien Planet (1962)

Double Jeopardy (1952)
Tales from Gavagan's Bar (1953) (with L Sprague de Camp)
The Mathematics of Magic (2007) (with L Sprague de Camp)

The Heroic Years (1934)
The Lost Battalion (1938) (with Thomas Johnson)
The Navy - A History (1938)
Sea Power and Today's War (1939)
Secret and Urgent: The Story of Codes and Ciphers, Vol. 72 (1939)
Road to Empire (1939)
America and Total War (1941)
Fighting Ships of the U. S. Navy (1941)
Naval War Game (1941)
What the Citizen Should Know about Modern War (1942)
The Navy has Wings (1943)
My Life to the Destroyers (1944) (with L A Abercrombie)
The Navy's War (1944)
Empire and the Sea (1946)
Fleet Against Japan (1946)
Night Work (1946)
Man and His Meals (1947) (with Robeson Bailey)
The Marines' War (1948)
Ordeal by Fire (1948)
Empire and Glory (1949)
Eleven Generals (1949)
The Third King (1950)
Prebble's Boys (1950)
Monitor and the Merrimac (1951)
Rockets, Jets, Guided Missiles, and Space Ships (1951) (with J Croggins)
Stanton, Lincoln's Secretary of War (1953)
My Diary (1954)
All About Famous Inventors and Their Inventions (1955)
The Civil War (1955)
All About Rockets and Jets (1955)
The Civil War in Pictures (1955)
Civil War on Western Waters (1956)
The Battles That Changed History (1956)
The Compact History of the United States Navy (1957)
A Short History of the Civil War: Ordeal by Fire (1992)

The Outer Reaches (1951)
     aka The Time of Infinity
Spaced Out (1975)
Magic for Sale (1983)
The Flying Sorcerers (1997)