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<p>Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.
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<br>Subjects: center; velocity; body; equal; weight; force; gravity; bodies; rays; space described; common center; specific gravity; inclined plane; google natural; convex lens; forces acting; takes place; square roots; north pole</div>
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Denison Olmsted</div>
Internet Archive identifier