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- "Water Resources Assessment of Guatemala" (PDF). US Army Corps of Engineers. June 2000. Archived from the original (PDF) on January 9, 2009. Retrieved 2009-06-04.
- "Guatemala - Surface Water Map" (PDF). US Army Corps of Engineers. June 2000. Retrieved 2009-06-04.
- Rand McNally, The New International Atlas, 1993.
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