Shortly after

Shortly after receiving his PhD, he published "The Problem of the Wilderness", a celebrated defense of wilderness preservation that expanded some of the themes developed in his earlier article, "The Wilderness as a Minority Right".[35] When it was published in The Scientific Monthly in February 1930, "The Problem of the Wilderness" had already been rejected by four other magazines, but it became one of his most important works. He argued that wilderness was worth saving not only because of its unique aesthetic qualities, but because of its ability to provide visitors with a chance for adventure.[36] Marshall went on to state: "There is just one hope of repulsing the tyrannical ambition of civilization to conquer every niche on the whole earth. That hope is the organization of spirited people who will fight for the freedom of the wilderness."[37] The article became a much-quoted call to action and is today considered seminal by wilderness historians.[38]


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