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Heliostat at Draper's Hastings-on-Hudson Observatory: undated

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Machinery: undated

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Draper's Hastings-on-Hudson Observator: undated

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Draper's Hastings-on-Hudson Observatory: undated

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Draper's Hastings-on-Hudson Observatory: undated

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Draper's Hastings-on-Hudson Observatory: undated

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Draper's Hastings-on-Hudson Observatory: undated

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X-Ray: undated

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X-Ray: undated

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X-Ray: undated

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X-Ray: undated

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X-Ray: undated

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X-Ray (7): undated

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X-Ray: undated

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NYU Campus Model: 1890s

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NYU Campus: 1890s

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NYU Campus: 1890s

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NYU Campus: 1890s

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NYU Campus Model: 1890s

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NYU Campus: 1890s

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NYU Campus (15): 1890s

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NYU Campus: 1890s

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NYU Campus: 1890s

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NYU Exhibit at World's Columbian Exposition, Chicago -- by C.L. Bristol: 1893

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