Since its offering , Google has quadrupled its staff , to more than 9,000 employees -- many with doctorates from the world 's leading universities -- and it is hiring more than 100 people a week to fill three dozen or so offices in more than 20 countries ; its headquarters are in Mountain View , Calif. , in Silicon Valley .
Silicon Valley /location/location/contains Mountain View
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Silicon Valley
LOCATION
Mountain View
LOCATION
/location/location/contains