Signed book: Actinochimie: Les Prolegomenes, Les Postulats by Marc Landau. Paris: Hermann & Cie., 1936. Softcover, 5.5 x 9, 125 pages. Signed and inscribed on the first free end page in fountain pen by the author, "A N. Bohr, hommage de profunde admiration, M. Landau, 20.IX.36." To the left of the inscription is a stamped facsimile signature of Bohr, indicating that the volume originates from his personal library. Autographic condition: fine, with uniform toning. Book condition: VG/None. Mark Landau, who also wrote under the pseudonym Mark Aldanov, was a Russian writer and critic known for his historical novels; he was nominated for the Nobel Prize in Literature thirteen times.