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![Tracts : Containing I, Mechanics, or the doctrine of motion II. the projection of the sphere. III. the laws of centripetal and centrifugal force. A Ne [Paperback]](/itemImage/2/0/1/2/2_6702609.jpg "Tracts : Containing I, Mechanics, or the doctrine of motion II. the projection of the sphere. III. the laws of centripetal and centrifugal force. A Ne [Paperback]")