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[1]Archived 1 November 2022 at the Wayback Machine Gems and Gemstones: Timeless Natural Beauty of the Mineral World, By Lance Grande
"The team also dated features consistent with the planting, digging, and tethering of plants and localized drainage systems to 10,000 years ago. Mounds constructed to plant water-intolerant plants such as bananas, sugarcane, and yams are dated to about 6,500 years ago." "Was Papua New Guinea an Early Agriculture Pioneer?" By John Roach, for National Geographic News, June 23, 2003
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