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Title An Atlas of Sunspot Umbral Spectra in the Visiable from 15,000 to 25,500 cm -1 (3920 to 6664 A). Author Wallace L. Co-authors Hinkle K. Livingston W.C. Issue 1 Issue data Tucson : National Solar Observatory , February 2000 Copy count 1, currently available 0, at library only 1