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B. E. Roe and D. R. Just, “Internal and External Validity in Economics Research: Tradeoffs between Experiments, Field Experiments, Natural Experiments and Field Data,” American Journal of Agricultural Economics, Vol. 91, No. 5, 2009, pp. 1266-1271. Hdoi:org/10.1111/j.1467-8276.2009.01295.x

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