Note 430 — Chapter XIV · RADIO-ACTIVITY OF THE ATMOSPHERE AND OF ORDINARY MATERIALS.
Reading edition
Ebert, Phys. Zeit. 2, p. 622, 1901. Zeitschr. f. Luftschiffahrt, 4, Oct. 1902.
Reading edition
Ebert, Phys. Zeit. 2, p. 622, 1901. Zeitschr. f. Luftschiffahrt, 4, Oct. 1902.