Cosmic-ray results

<p>Huancayo, Peru, January 1946-December 1955, Instituto Geofisico de Huancayo</p><p></p>Cheltenham, Maryland, March 1936-December 1955, U.S. Coast and Geodetic Survey, Cheltenham Magnetic Observatory<p></p>Christchurch, New Zealand, January 1947-December 1955, Department of Scientific and Industrial Research, Magnetic Survey Division<p></p>Godhavn, Greenland, January 1947-December 1950, Det Danske Meteorologiske Institut, Geofysisk Observatorium<p></p>Carnegie Institution of Washington publication 175, vol. XX<p></p>"Researches of the Department of Terrestrial Magnetism, vol. XX"