The flame of atomic hydrogen and its application to the determination of transition-probabilities.

Bold, Hermanus Johannes van den.

Noord-Hollandsche Uitgevers Maatschappij, Amsterdam, 1945

Blue cloth. x,96 pp., ill.; 24.5x16.5 cm. Thesis University of Utrecht. Text in English. - (some spots/ foxing mainly to edges) Otherwise very good, see picture