Correspondence, photographs, biographical materials, clippings, official commissions and citations, chiefly concerning his service record and military activities. Correspondents include Porfírio Díaz, Leonard Wood, and Harrison Gray Otis. Also includes correspondence of Ernest Kosterlitsky concerning a projected book about his father.
Some materials materials in this collection are reprinted in Emilio Kosterlitsky : Eagle of Sonora and the Southwest Border, by Cornelius C. Smith, Jr., published by Arthur H. Clark Co, 1970. Officer; Mexican Army, 1873-1914. Special Agent, U.S. Dept. of Justice, 1915-1927.