Retrieving "Harvard Stellar Classification Scheme" from the archives

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1. Stellar Catalogues

   Linked via "Harvard system"

   Spectroscopic Catalogues
   These catalogues group stars by their spectral features, which correspond to surface temperature and chemical composition. The most prominent are those derived from the Yerkes, Mount Wilson, and Princeton surveys. Early spectroscopic classification (the [Harvard system](/entries/harvard-stella…