Mark Jamieson, In Search of the Last 'Wild' Apaches of the Sierra Madre, The Journal of the Royal Anthropological Institute, Vol. 12, No. 2 (Jun., 2006), pp. 457-459 ...

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The 56,259 ha biosphere lies within rugged forested mountains about 100 km northwest of Mexico City. Every autumn, millions, perhaps a billion, butterflies from wide areas of North America return to ...