Book excerpt: Annals of the International Geophysical Year, Volume X: The Fifth Meeting and the Termination of CSAGI reflects the activities at the Fifth Meeting of the CSAGI concerning the World Days, meteorology, geomagnetism, aurora, airglow, and ionosphere. This work also covers other IGY activities and observations related to solar activity, cosmic rays, latitudes, longitudes, glaciology, oceanography, rockets, satellites, seismology, gravimetry, and nuclear radiation. This book also provides information on the termination of the CSAGI and the formation of the special committee for the inter-union cooperation in geophysics. This book will be of value to geophysicists, historians, and researchers.