Hell's Half Acre, once 30 acres of native tidal marsh, is now dominated by Phragmites and other invasive plants.

Hell's Half Acre, coined by Bernard DeVoto in his 1955 Harper's essay, was defended as an important local natural area by DeVoto and other Cambridge residents, including Josep Luis Sert and Arthur Schlesinger

 

Inventing the Charles River, Karl Haglund

 

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