Free Preview of Wave-lengths Longer Than 5500 Å. in the arc Spectra of Yttrium, Lanthanum and Cerium and the Preparation of Pure Rare-earth Elements Volume Scientific Papers of the Bureau of Standards, Vol. 17, p. 317-351 (1921) Scientific Paper 421 (S421)
Wave-lengths Longer Than 5500 Å. in the arc Spectra of Yttrium, Lanthanum and Cerium and the Preparation of Pure Rare-earth Elements Volume Scientific Papers of the Bureau of Standards, Vol. 17, p. 317-351 (1921) Scientific Paper 421 (S421)