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Plane And Spherical Trigonometry by Lyman M. Kells Calculus by Lyman M. Kells Elementary Differential Equations by Lyman M. Kells Intermediate Algebra by John Tobey K+E slide rules by Lyman M. Kells Navigation Part 1-2 by Lyman M. Kells The log log duplex trig ... slide rule no.4080; by Lyman M. Kells Log Log Duplex Decitrig Slide Rule 4081 by Lyman M. Kells Elementary differential equations, by Lyman M. Kells Elements of trigonometry by Lyman M. Kells


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