other references :
- http:/
/ www.ict-21.ch/ l4d/ pg/ file/ read/ 882338/ collapse-how-societies-choose-to-fail-or-succeed-jared-m-diamond - http:/
/ www.bing.com/ videos/ search?q=youtube+tainter+joseph&qpvt=youtube+Tainter+Joseph&FORM=VDRE
and a picture to finish
see also Daniel Curtis http:/
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