Dictionary of Greek and Roman Geography—Smith.
Dictionary of Arts, Manufactures, and Mines—Ure.
Dictionary of Every Days Difficulties—Shilton.
Dictionary of Science, Literature, and Art—Brande.
Elements of the Art and Science of War—Wheeler.
Elements of Military Arts and Sciences—Halleck.
Encyclopædia Britannica.
French and English Pronouncing Dictionary—Spiers and Surenne.
Field Exercise (English), 1870.
Field-Book of the Revolution—Lossing.