It has been said many times before, and it will be many times again: Warren Buffett is the greatest investor of all time. And the proof is in the pudding: Despite his considerable philanthropic endeavors over the decades, the Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) chief executive officer consistently ranks among the richest individuals on the planet.

Among the many world-class businesses in Berkshire Hathaway's $345.4 billion investment portfolio, here are two that I think dividend growth investors should strongly consider buying this month.

It's no secret that Buffett and his business partner Charlie Munger prefer to invest in businesses that are profitable and possess competitive moats. Mastercard (NYSE: MA) fits that description, and Berkshire Hathaway owns a 0.4% stake in it valued at $1.5 billion.

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Source Fool.com