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Which sentence is grammatically correct?

• The papers are freely available at the journal website.
• The papers are freely available on the journal website.

Using Google's search results:

• available at the website returns 72,800,000 results.
• available on the website returns 106,000,000 results.

So, I inferred that both variants are popular. Is this method (comparing the number of results by Googling) sound?