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The Ash Family of Chester and Lancaster Counties, Pennsylvania
Daniel Henrich Esch, born in 1717 in Hachenberg, Hessen-Nassau, Germany, immigrated to America in 1741 and settled in Pennsylvania. He married Elizabeth Kerlin about 1743, and was lost at sea about 1746/1747. Descendants listed in this book lived primarily in Pennsylvania and the mid-western states.
The Artizan
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Iron
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Mechanics' Magazine
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Mechanics Magazine
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List of Diplomatic and Consular Officers of the United States
List for March 7, 1844, is the list for September 10, 1842, amended in manuscript.
Introduction to Knot Theory
Knot theory is a kind of geometry, and one whose appeal is very direct because the objects studied are perceivable and tangible in everyday physical space. It is a meeting ground of such diverse branches of mathematics as group theory, matrix theory, number theory, algebraic geometry, and differential geometry, to name some of the more prominent ones. It had its origins in the mathematical theory of electricity and in primitive atomic physics, and there are hints today of new applications in certain branches of chemistryJ The outlines of the modern topological theory were worked out by Dehn, Alexander, Reidemeister, and Seifert almost thirty years ago. As a subfield of topology, knot theory ...
