91012.  Ponce, V. M. 2016. The Tomas Canyon, Peru, A unique geological marvel

91011.  Ponce, V. M. 2009. The necropolis of Otuzco, Northern Peru  South American Explorer, 89.

91010.  Ponce, V. M. 2005. Photos in "Builders of the Lost Tombs" by A. Rivera  South American Explorer, 79, 16-21.

91009.  Ponce, V. M. 2005. The curious legacy of Pampa Grande  South American Explorer, 77, 24-27. (HTML)

91008.  Ponce, V. M. 2003. Travels on the Rio Paraguay  South American Explorer, 73, 27-34. (HTML)

91007.  Ponce, V. M. 2003. Viva el Peru, Karajia!  South American Explorer, 70, 26-28. (HTML)

91006.  Ponce, V. M. 1999. Alexander von Humboldt on Geophagy   South American Explorer, 55, 22-25.

91005.  Ponce, V. M. 1994. The Gran Bajo de San Julián  South American Explorer, 38, 38-40.

91004.  Ponce, V. M. 1992. Letter to SAE   South American Explorer, 31, 37.

91003.  Ponce, V. M. 1990. The One True Way   South American Explorer, 26, 30-34.

91002.  Ponce, V. M. 1989. With Humboldt on the Casiquiare   South American Explorer, 23, 4-12.