L. David Roper
http://www.roperld.com/personal/roperldavid.htm
06-Apr-2016
The area of the Guarani Aquifer is 1.2 x 106 km2.
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L. David Roper interdisciplinary studies
L. David Roper, http://www.roperld.com/personal/roperldavid.htm
6 April, 2016