. . "United States" . . "1918 - 1945" . . . . . . . "Capital formation and its elements a series of papers presented at a symposium conducted by the Conference Board"@en . "Capital formation and its elements : a series of papers presented at a symposium conducted by the Conference Board" . . "Capital formation and its elements a series of papers presented at a symposium conducted by the Conference board"@en . . . . . "Capital formation and its elements; a series of papers presented at a symposium conducted by the Conference Board"@en . . . . . .