National Research Council (U.S. Committee on X-rays and Radioactivity. Radioactivity [microform] : Report of Committee on x-rays and radioactivity, National research council, by A. F. Kovarik and L. W. McKeehan.

National Research Council (U.S. Committee on X-rays and Radioactivity.

Radioactivity [microform] : Report of Committee on x-rays and radioactivity, National research council, by A. F. Kovarik and L. W. McKeehan.

Radioactivity.

1929.

Kovarik, Alois Francis, 1880-1965.

McKeehan, L. W. (Louis Williams), 1887-1975