Arthur Jorgensen
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Friday the Thirteenth
Klaus Puhlmann
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Calendar Math
Art Jorgensen
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A Fence for the Community Pasture
Klaus Puhlmann
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Calendar Math
Art Jorgensen
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My Grandfather’s Mathematical Legacy
Klaus Puhlmann
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Calendar Math
Art Jorgensen
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The Problem with Factorials!
Klaus Puhlmann
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Geometry for Gardeners
Helmut Gorenflo (Translated by Klaus Puhlmann)
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Calendar Math
Arthur Jorgensen