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A photo taken 25 years ago along the route to Mexico's Piedras Bola megaspherulites. The elusive trail often disappeared completely.

A photo taken 25 years ago along the route to Mexico's Piedras Bola megaspherulites. The elusive trail often disappeared completely.

© John Pint, 2009

Source article: Las Piedras Bola: the great stone balls of Ahualulco
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