1. The solar magnetograph;Babcock;Astrophys. J.,1953
2. The topology of the sun's magnetic field and the 22-year cycle;Babcock;Astrophys. J.,1961
3. Bohlin , J. D. D. M. Rubenstein Synoptic maps of coronal hole boundaries for the manned Skylab missions: 24 May-23 June 1973; 2 August-24 September 1973; 21 November 1973-2 February 1974 Boulder, Colo. 1975
4. Bohlin , J. D. R. A. Howard M. J. Koomen Tentative ideas about coronagraph instrumentation 1975
5. The sun's polar caps as coronal holes, their sizes, evolution, and phenomenology during the Skylab mission;Bohlin;Bull. Amer. Astron. Soc.,1975