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Classification of 1,477 stars by means of their photographic spectra
- "Miscellaneous investigations forming a part of the Henry Draper memorial"
- "Miscellaneous investigations forming a part of the Henry Draper memorial"@en
- "Classification"
- "Classification"@en
- "Classification of 1,477 stars by means of their photographic spectra"
- "Classification of 1,477 stars by means of their photographic spectra"@en