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Revenues by source
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The following table presents our revenues by revenue source (in millions, unaudited):
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Twelve Months Ended
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December 31,
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2013 2014 2015
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Revenues:
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Google websites $37,422 $45,085 $52,357
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Google Network Members' websites 13,650 14,539 15,033
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Google advertising revenues 51,072 59,624 67,390
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Google other revenues 4,435 6,050 7,151
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Google segment revenues 55,507 65,674 74,541
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Other Bets revenues 12 327 448
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Total revenues $55,519 $66,001 $74,989
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