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- [3] The Introduction of Farm Machinery in Its Relation to the Productivity of Labor in the Agriculture of the United States During the Nineteenth Century JOURNAL OF FARM ECONOMICS, 1932, 14 (03): : 514 - 515
- [4] PRODUCTIVITY IN CANADA, THE UNITED KINGDOM, AND THE UNITED STATES OXFORD ECONOMIC PAPERS-NEW SERIES, 1952, 4 (03): : 235 - 242
- [6] WAGES IN THE UNITED KINGDOM IN THE NINETEENTH CENTURY ANNALS OF THE AMERICAN ACADEMY OF POLITICAL AND SOCIAL SCIENCE, 1900, 15 : 129 - 130