Mapping the Solar Corona in X-Ray Lines of O VII and NE IX Catura, R. C. ; Acton, L. W. ; Meyerott, A. J. ; Culhane, J. L. Abstract Publication: Space Science Reviews Pub Date: September 1972 DOI: 10.1007/BF00213509 Bibcode: 1972SSRv...13..742C