The Mystery Boys and the Inca Gold

Fletcher, J. S. (Joseph Smith), 1863-1935

Oppenheim, E. Phillips (Edward Phillips), 1866-1946

Freeman, R. Austin (Richard Austin), 1862-1943

Rees, Arthur J. (Arthur John), 1872-1942

French, Joseph Lewis, 1858-1936 [Editor]

Carsey, Alice [Illustrator]; Sherwood, Elmer, 1884-

Finlay, Virgil, 1914-1971 [Illustrator]; Smith, George O. (George Oliver), 1911-1981

Hume, Fergus, 1859-1932

Wenzell, A. B. (Albert Beck), 1864-1917 [Illustrator]; Walk, Charles Edmonds, 1875-1943?

Kernahan, Coulson, 1858-1943

Hammett, Dashiell, 1894-1961