1. DeWitt, C. (ed.): Geophysics, The Earth’s Environment. New York: Gordon and Breach 1962.
2. Johnson, F. S. (ed.): Satellite Environment Handbook, 2nd ed. Stanford, Calif.: Stanford University Press 1965.
3. King, J. W., and W. S. Newman (ed.): Solar-Terrestrial Physics. London-New York: Academic Press 1967.
4. Odishaw, H. (ed.): Research in Geophysics, Vol. 1: Sun, Upper Atmosphere, and Space. Cambridge, Mass.: The M. I. T. Press 1964.
5. Axford, W. I.: Observations of the interplanetary plasma. Space Sci. Rev. 8 (3), 331–365 (1968).