. . . . "The national bureau's first quarter-century" . "The National Bureau's First Quarter-Century" . . "The National bureau's first quarter-century, by Wesley C. Mitchell"@en . . . . . . . . "The National Bureau's first quarter-century" . . "The National bureau's first quarter-century"@en . "The National bureau's first quarter-century" . . . . . "National Bureau of Economic Research" . . "National bureau of economic research (Stati Uniti d'America)" . .