Obituaries for John Bolton, winner of the 1968 Henry Norris Russell Prize and leading radio astronomer at the CSIRO Radiophysics Division and California Institute of Technology, have appeared in: (1) Physics Today for April, 1994, (2) Quarterly J. Royal Astronomical Soc., Vol. 35, pp. 225-6 (1994), and (3) J. Astrophys. Astron. (India), Vol. 14, pp. 115-120 (1993).