Doyle, John T. 1819-1906 The Central Pacific R.R. Debt: California's Remonstrance Against Refunding It

Schumacher, Verena Bucher 1906- Family Record of the Children of Peter Hilty 1821-1892 and Elizabeth Neuenschwander Hilty 1819-1894

Bingham, Hiram The Journal of an Expedition Across Venezuela and Colombia, 1906-1907: And Exploration of the Route of Bolivar's Celebrated March of 1819 and of the Battle-Fields of Boyacá and Carabobo