DP - MPI Library TY - JOUR T1 - Radio Communications in Mines Found Successful UR - https://www.jstor.org/stable/3924988 T2 - Science newsletter : the weekly summary of current science SP - Vol. 53, No. 26 (1948), p. 409 CY - Washington PY - 1948 N1 - Copyright: Copyright 1948 Science Service, Inc. ER -