The warm and sunny hills of Napa and Sonoma valleys , an hour north of San Francisco, are by reputation, if not statistically, at the center of the American wine industry; their 29,000 grape-acres turn out vintages to satisfy a snobbery every bit as rampant as in Europe. In summer, cars jam Hwy-29 through its heart, as visitors embark on a day's free drinking, thinly disguised as an avid interest in wine.

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