TY  - BOOK
AU  - Wallace, L
AU  - Hinkle, K
AU  - Livingston, W. C
TI  - Sunspot umbral spectra in the regions 1925 to 2226 and 2392 to 3480 cm-1 (2.87 to 4.18 and 4.48 to 5.35 m)
PB  - National Solar Observatory
KW  - Sunspot
KW  - Umbral spectra
ER  -