^Annual Report of the Secretary of War, Volume 3. War Department, US Government Press. 1914. p. 144.
References
Udías Vallina, Agustín (2003). Searching the Heavens and the Earth. The History of the Jesuit Observatories, Dordrecht: Kluwer Academic Publishers, p. 293.
Warren, James Francis (2009). "Scientific Superman: Father José Algué, Jesuit Meteorology, and the Philippines under American Rule, 1897-1924." In Colonial Crucible: Empire in the Making of the Modern American State, Part VIII, University of Wisconsin Press.