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=== What do the authors tests achieve?===
Findings include that from 1880 to 1890 and 1890 to 1900 counties with the least woodland made large relative gains in the improvement of farmland. By contrast, there were no substantial changes at low woodland areas before 1880 or after 1900 or in higher woodland areas from 1880-1900.
===How could the tests be improved on? Strengths? Weaknesses?===
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