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https://support.google.com/webmasters/answer/189077?hl=en
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Get access to data on 6,321,487 websites that are Spanish HREF LANG Customers. We know of 1,232,581 live websites using Spanish HREF LANG and an additional 5,088,906 sites that used Spanish HREF LANG historically and 530,852 websites in the United States.
Spanish HREF LANG websites that are also using other technologies.
Get a list of 6,321,487 websites using Spanish HREF LANG which includes location information, hosting data, contact details, 1,232,581 currently live websites and an additional 2,252,174 domains that redirect to sites in this list. 5,088,906 sites that used this technology previouslyand 530,852 websites in the United States currently using Spanish HREF LANG.
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