H. E. Bolton Papers, Part 1, Bancroft Library, University of California, Berkeley. (AGN, Misiones, T. 14):

H. E. Bolton Papers, Part 1, Bancroft Library, University of California, Berkeley. (AGN, Misiones, T. 14):, Box: 10. Campbell W. Pennington Papers, 33036864. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/279344 Accessed September 25, 2026.