The major source of information on Horace Capron
is his own autobiography including his Japanese Journal.
The original typescript of these (there is no holographic
copy) are at the U.S. Department of Agriculture, National
Agricultural Library. The Laurel Historical Society John
Brennan Library has a copy of both publications. Major
manuscript collections relating to Horace Capron can be
found at three institutions: The Library of Congress,
Yale University Horace Capron Collection, and the U.S.
Department of Agriculture, National Agricultural Library.
Materials relating to the early charter of the Patuxent
Manufacturing Company can be found at the Archives of
Horace Capron, “Memoirs of Horace
Capron” 2 vols., nd, typed copy, National Agricultural
Library, U.S. Department of Agriculture
Horace Capron. Reports and Official
Letters by Horace Capron, Commissioner and Advisor and His
Foreign Assistants (Tokyo: 1875)
Merritt Starr, “General Horace Capron,
1804-1884,” Journal of the Illinois State Historical
Society 18 (July 1925): 259-349.
Fumiko Fujita. American Pioneers
and the Japanese Frontier: American Experts in
Nineteen-Century Japan (Westport, CN: Greenwood Press,
“Stoneman’s Raid” (MOLLUS publication
of Capron’s account of the battle
Louisa Kerwin Thiers, “An American
Advisor to the Japanese Government” Journal of American
History 7 (October-December 1913): 1415-25.