The official publication date of April 14, 1939, was exactly four years to the day of the Black Sunday Storm, among the worst of the Dust Bowl dust storms, which, in real life, caused many Oklahomans to migrate to California in search of work.
Gardner, John (1991) [1984]. The Art of Fiction: Notes on Craft for Young Writers (Vintage Books ed.). Vintage Books.
Symynkywicz, Jeffery B. (2008). The Gospel According to Bruce Springsteen: Rock and Redemption, from Asbury Park to Magic. en:Westminster John Knox Press.