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The big four : the story of Huntington, Stanford, Hopkins, and Crocker, and of the building of the Central Pacific
Lewis, Oscar, (1938)
Oskar Lewis' Hypothese von der "culture of poverty" : zum Stand der Diskussion
Goetze, Dieter, (1970)
Flores de Lemus, una revisión
Velarde Furtes, Juan, (1982)