00438nam a2200157Ia 4500003000900000008004100009040001600050080002400066100001500090245007700105260004700182650001000229650001100239650001200250700001800262IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a523.982(084.4)bWAL  aWallace, L 3aAn Atlas of a dark sunspot unbral spectrumcL. Wallace and W. Livingston  aAurabThe National Optical Astronomyc2003  aAtlas  acorona  aSunsopt  aLivingston, W