Signed book: Ondes et Electrons [Waves and Electrons] by Pierre Bricout. First edition. Paris: Librairie Armand Colin, 1929. Softcover, 4.5 x 6.75, 215 pages. Signed and inscribed on the first free end page in ink, "A Monsieur le Professeur N. Bohr, hommage de l'auteur, P. Bricout." The half-title page bears a stamped facsimile signature of Bohr, indicating that the volume originates from his personal library. Autographic condition: fine, with light toning. Book condition: G+/None, with general wear, chipping and losses to spine, and the front hinge reinforced with tape.