London: Royal Society, 1909. First edition, offprint. Presentation copy. “N. Bohr” in red crayon on front wrapper. Inscribed in ink in Danish to "Hr. Prof. E. Biilmann ærbødigst fra Forfatteren." [Mr. Professor E. Biilmann respectfully from the author]. In original wrappers. Wrappers with folding mark, little soiling. Spine slightly damaged.....
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