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On the Development and Distribution of Primitive Locks and Keys
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On the Duty of Civil Disobedience
Henry David Thoreau |
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On the Economy of Machinery and Manufactures
Charles Babbage |
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On the Edge of the Arctic; Or, An Aeroplane in Snowland
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On the Edge of the Primeval Forest / Experiences and Observations of a Doctor in Equatorial Africa
Albert Schweitzer |
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On the Edge of the War Zone / From the Battle of the Marne to the Entrance of the Stars and Stripes
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On the effect of electric and magnetic fields on spectral lines
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On the effect of the motion of a body upon the velocity with which it is traversed by light
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On the Equator
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On the Ethics of Naturalism
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