"USA." . . "USA" . "Gross national product United States." . . "Industrial productivity United States." . . . . "Industrie." . . "Industrie" . "Productividad." . . "Industrial productivity." . . "Productivité États-Unis." . . "United States" . . "United States." . "Production (Economic theory)" . . "Producción Planificación." . . "États-Unis" . . "Production." . . "Producto nacional bruto EE. UU." . . "Produit national brut États-Unis." . . "Produktivität." . . "Produktivität" . "Gross national product." . . "Since 1981" . . "EE. UU." . . "Producción (Teoría económica)" . . "Producto nacional bruto Estados Unidos." . . "Economic policy." . . "Amerika" . . "Economische groei." . . "Verenigde Staten van Amerika." . . . . . "Productivity problems, prospects and policies" . . . . . . . . . "Productivity : problems, prospects, and policies" . . . "Productivity: Problems, prospects, and policies" . . . . . . . . . . . . . . . . . . . . . . . "Productivity--problems, prospects, and policies" . "Productivity--problems, prospects, and policies"@en . . . . . "Productivity: Problems, prospects, and policies : problems, prospects, and policies" . . . "Productivity"@en . . . . . . . . . . . "1981 - 1993" . .