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Title An Atlas of a Dark Sunspot Umbral Spectrum from 1970 to 8640 cm-1 (1.16 to 5.1 micro m) Author Wallace L. Co-authors Livingston W. Issue 1 Issue data Tucson : Kitt Peak National Observatory, National Optical Astronomy Observatories, National Solar Observatory , March 1992 Copy count 1, currently available 0, at library only 1 
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