. . . . . "Levels of living of U.S. farm families selected annotated references, 1940-1955"@en . "Levels of living of U.S. farm families : selected annotated references, 1940-1955" . . . . . . . . . "The list of references in this volume was prepared to help our current research workers in the study of levels of living of farm families in the United States." . . "Bibliography"@en . "Bibliography" . . "Agriculteurs États-Unis Bibliographie." . . "Coût et niveau de la vie États-Unis Bibliographie." . .