The New York Giants hit four inside-the-park home runs at Braves Field on April 29, 1922, en route to a 15-4 victory over Boston. George Kelly collected a pair of inside-the-parkers, and Ross Youngs and Dave Bancroft contributed the other two scoring dashes around the bases. You can find the box score and play-by-play recap of the game here.

And, according to your link, all of them 2 run shots. Wow.
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The power of small ball
Indeed
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