"On Guthrie's return to New York after atrek across country in 1952, the symptoms of Huntington's chorea, inherited from his mother, were beginning to manifest themselves. At his wife's urging, Guthrie voluntarily entered a hospitol. Finding it difficult to perform and even to write, he remained hospitalized for most of the time until his death at Creedmore State Hospital in Queens, N.Y." emphasis added.

Garraty,John A., Carnes, Mark C, editors, Dictionary of American Biography - Supplement Eight 1966-1970, Charles Scribner's Sons, New York, Collier Macmillan Publisher London, 1988, p234.