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Approximation theory. 1

Archives 1

Calculus. 1

Clock and watch making. 1

Decorative arts -- Pennsylvania. 1

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Folk art -- Pennsylvania. 1

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Installment contracts. 1

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Mathematicians -- United States -- Correspondence. 1

Mathematics -- Study and teaching (Higher) -- Pennsylvania -- Millersville. 1

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Reformed Church -- Pennsylvania -- Lancaster County. 1

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