US Geological Survey
Usgs: Trends in Ground Water Use, 1950 2005
This site from USGS describes the importance of ground-water, provides a map of ground-water use (by state), a map of the percent of total withdrawals coming from ground water, and a map of the percent of public-supplied population...
Other
Materiales Para La Convivencia Escolar
Texts and videos using native speakers about materials for school life, oriented to the promotion of values and educational resources that favor the improvement of coexistence in the classroom, in the center and in society.