[Girard College] Magnetic Observatory, "Design for a Magnetic Observatory Girard College" Construction Drawings - II. 08. Magnetic Observatory, Girard College. Local ID #: II.08.01
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[Girard College] Magnetic Observatory, "Magnetic Observatory of Girard College North-East View" Construction Drawings - II. 08. Magnetic Observatory, Girard College. Local ID #: II.08.02
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[Girard College] Magnetic Observatory, "Magnetic Observatory of Girard College East Front North End South End" Construction Drawings - II. 08. Magnetic Observatory, Girard College. Local ID #: II.08.03
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