Leverage Points: Places to Intervene in a System, 1999. The Academy for Systems Change. page 
, pdf
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December 24, 1987 – The earth was formed whole and continuous in the universe, without lines.
Donella MeadowsLeverage Points: Places to Intervene in a System, 1999. The Academy for Systems Change. page , pdf
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December 24, 1987 – The earth was formed whole and continuous in the universe, without lines.