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Comparison of the Paschen and the Balmer Series of Hydrogen Lines in Stellar Spectra, by Paul W. Merrill and Olin C. Wilson, Jr

Olin Chaddock WilsonPaul Willard Merrill

URL	http://books.google.com.hk/books?id=biFQQwAACAAJ&hl=&source=gbs_api