Plates 1 to 10] CONTENTS I. P h o t o s p h e r e and l o w c h r o m o s p h e r e pa g e D. L. L a m ber t High resolution interferometric studies of the solar magnesium n doublet spectral region 47 T. A. C l a r k , G. R. C ourts and R. E. J ennings A measurement of the brightness temperature of the Sun in the range 65 to 180 cm-1 55 II. C h r o m o s p h e r e and co r o n a R. T ousey Observations of the extreme ultraviolet solar spectrum 59 C. W. A llen Interpretation of extreme

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... t emissions from the Sun 71 H. Z ir in The manifold structure of the chromosphere and corona 77 W. M. Bu r t o n , C a r o le J o r d a n , A. R id g e l e y and R. W ilson The structure of the chromosphere-corona transition region from limb and disk intensities 81 L. H er o u x and M. C o h en Measurements of electron temperature in the solar chromosphere and corona 99