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- The Blue and the Gray, by Thomas B. Allen ; photography by Sam Abell ; prepared by the Book Division, National Geographic Society
- George Washington, spymaster, how America outspied the British and won the Revolutionary War, Thomas B. Allen ; featuring illustrations by Cheryl Harness
- Mr. Lincoln's high-tech war, how the North used the telegraph, railroads, surveillance balloons, ironclads, high-powered weapons, and more to win the Civil War, Thomas B. Allen & Roger MacBride Allen