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Letter from Henry Allen Hazen, Washington, to Robert Traill Ormond, Director of Ben Nevis Observatory
Letter from Henry Allen Hazen, Washington, to Robert Traill Ormond, Director of Ben Nevis Observatory
Letter from Robert Traill Ormond, Ben Nevis Observatory, to Andrew John Herbertson
Letter from Robert Traill Ormond, Ben Nevis Observatory, to Andrew John Herbertson