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windmills
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Letter from Alexander Duncan about his improved horizontal windmill, with drawing and envelope
Letter from Alexander Duncan about his improved horizontal windmill, with drawing and envelope
Letter from Alexander Duncan about his improved horizontal windmill
Letter from Alexander Duncan about his improved horizontal windmill
Letter from a candidate about a horizontal windmill
Letter from a candidate about a horizontal windmill
Description of the model of a horizontal windmill
Description of the model of a horizontal windmill