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https://support.google.com/webmasters/answer/189077?hl=en
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Get access to data on 5,397,808 websites that are Spanish HREF LANG Customers. We know of 2,349,459 live websites using Spanish HREF LANG and an additional 3,048,349 sites that used Spanish HREF LANG historically and 1,215,486 websites in the United States.
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Get a list of 5,397,808 websites using Spanish HREF LANG which includes location information, hosting data, contact details, 2,349,459 currently live websites and an additional 1,875,245 domains that redirect to sites in this list. 3,048,349 sites that used this technology previously and 1,215,486 websites in the United States currently using Spanish HREF LANG.
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