Uranium and radium, by G. M. Butler and M. A. Allen. - Butler, G. M. (Gurdon Montague), 1881-; Allen, Milton Arthur, 1890- (Tucson, Ariz., Pub. by the University, Arizona Bureau of Mines, 1921)
Cover title.
Dated December 1, 1921, but includes material for 1922.
At head of title: University of Arizona bulletin.
Bibliography: p. 25-26.
Keywords: Uranium; Radium