More than two-thirds of California’s drinking water supply passes through or is stored in oak woodlands.
http://napavalleyregister.com/lifestyles/home-and-garden/columnists/bill-pramuk/bill-pramuk-s-trees-and-people-the-value-of-oak/article_747fc96f-050f-5f9b-94f0-ebb53f892a61.html
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