मुख्य उपनिषदः
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Each link leaves this site for a public edition. Translations and recensions vary. Nothing here replaces a teacher in your tradition.
Educational orientation only — not a canonical edition, a priest’s ruling, or medical or legal advice.
What this is
There is no single closed list; ten or thirteen names are commonly taught as principal. IIT Kanpur and the Vedic Heritage portal both open collections. A few of the most-read texts also have their own pages here.