James E. Homans, editor, The Cyclopædia of American Biography… (1918)
“ Later he helped actively in securing a site for the exposition; for seven years he labored for the success of this great enterprise. Though American born, Colonel Muckle was always an enthusiastic admirer of his father's nation. All his life he aided and supported numerous institutions in the city for the preservation of the identity of the German-American population. For the German Society, which he joined in 1853, and of which he was vice-president for thirteen years, he helped to plan the hall at Spring Garden and Marshall Streets. ”
