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George Ellery (1868-1938). [Sunspot photography] HALE
Two original Solar Photographs. Mount Wilson Solar Observatory, B 31 Northwest quarter of Sun, January 5, 1917, H? Hydrogen [and:] Mount Wilson Solar Observatory, B 9 North and South Sun-spots, September 9, 1908. H? Hydrogen.
Used [Publisher: Mt. Wilson Observatory, 1908] 1917-01-01
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