File:Collier's 1921 Porto Rico - plowing with modern machinery.jpg
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![File:Collier's 1921 Porto Rico - plowing with modern machinery.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Collier%27s_1921_Porto_Rico_-_plowing_with_modern_machinery.jpg/800px-Collier%27s_1921_Porto_Rico_-_plowing_with_modern_machinery.jpg?20130503155955)
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