Cosmic-ray results:/ Huancayo, Peru, January 1946-December 1955, Instituto Geofísico de Huancayo; Cheltenham, Maryland March 1936-December 1955, U.S. Coast and Geodetic Survey, Cheltenham Magnetic Observatory; Christ-church, New Zealand, January 1947-December 1955, Department of Scientific and Industrial Research, Magnetic Survey Division; Godhavn, Greenland, January 1947-Decmeber 1950, det Danske Meteorologiske institut, Geofysisk observatorium.
Carnegie Institution of Washington, Publication 175 (v. 20) Mode of access: Internet.