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5 aerial photographs, some of Boston and area, those dated from 1930s

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Care, Use and Method of Operating Wurdemann Dividing Machine

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Compass, The

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Diagram Wurdemann Graduating Engine No. 3

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General Instructions: Applicable to All Graduating Engines

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Graduating Compass Plates No. 1, 2 and 4 on Ramsden Graduating Engine

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Graduating Helter (?) & Brightly or "Pennsylvania" Arc on Temple Machine

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Graduating Horizontal Circle: to 1/2

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Graduating Horizontal Minute Verniers from #1, 2, and 4 plates on Temple Engine

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Graduating Vertical Circles to 1/2 on Temple Dividing Machine

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Graduating Vertical Verniers on the Temple Engine

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Graduations: Sextant and Other Reflecting Instrument Graduations, The

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