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Title An Atlas of the Sunspot Umbral Spectrum in the Red and Infrared from 8900 to 15,050 cm-1 (6642 to 11,230 A) Author Wallace L. Co-authors Livingston W Bernath P.F. Ram R.S. Issue 1 Issue data Tucson : Kitt Peak National Observatory, National Optical Astronomy Observatories, National Solar Observatory, Departments of Chemistry University of Waterloo, University of Arizona , August 1998 Copy count 1, currently available 0, at library only 1