Resource Depletion as Cause of Collapse, through 2007

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Powerdown revisited	web	Richard Heinberg	MuseLetter	2007-10-01
complexity, problem solving, and sustainable societies	web	Joseph A. Tainter		1996-01-01
conquest of the land over 7000 years	web	W. C. Lowdermilk	USDA	1953-08-01