"Goin' down the road feelin' bad" John Steinbeck's 'The grapes of wrath', and migrant folklore - Kagan, Sheldon S. (Philadelphia, Pa., Univ. of Pennsylvania, Diss., 1971, 1971)
Kopie, erschienen im Verl. Univ. Microfilms Internat., Ann Arbor, Mich.