- Colombia and World War I: The Experience of a Neutral Latin American Nation During the Great War and Its Aftermath, 1914-1921
- Experiment in Literacy: Distance Education on Colombia's Eastern Frontier
- Santiago Pérez Triana (1858 - 1916): Columbian Man of Letters and Crusader for Hemispheric Unity
- The Llanos Frontier in Colombian History 1830-1930
- From Frontier Town to Metropolis: A History of Villavicencio, Colombia, since 1842









