1. Coronal Holes;Altschuler;Solar Phys.,1972
2. The Origin of M-Region Geomagnetic Storms;Billings;Astrophys. Norveg.,1964
3. Rocket-Coronagraph Photometry of the 7 March 1970 Corona from 3 to 8.5 R;Bohlin;Solar Phys.,1971
4. J. D. Bohlin D. M. Rubenstein Synoptic Maps of Solar Coronal Hole Boundaries Derived from He II 304 A Spectroheliograms from the Manned Skylab Missions Report UAG 51 21 1975
5. Space Research;Bohlin,1975a