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LC Subject Heading: Signal flags

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Item 165

Signal flags, Portland Observatory, ca. 1810

Signal flags, Portland Observatory, ca. 1810

Contributed by: Maine Historical Society Date: circa 1810 Location: Portland Media: Art on paper

Item 6157

Signals at the Portland Observatory, ca. 1807

Signals at the Portland Observatory, ca. 1807

Contributed by: Maine Historical Society Date: circa 1807 Location: Portland Media: Watercolor on paper

Item 174

Signal flags, Portland, ca. 1800

Signal flags, Portland, ca. 1800

Contributed by: Maine Historical Society Date: circa 1800 Location: Portland Media: Paper

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