http://www.learner.org/resources/series45.html?pop=yes&pid=581 China's Altar L?
following joseph tainter, vaclav smil, ronald wright, jared diamond, peter turchin and niko tinbergen Failure is the best option
following joseph tainter, vaclav smil, ronald wright, jared diamond, peter turchin and niko tinbergen Failure is the best option