Texts:
Katha-Upanisad
Dramatic Fragments
 
Secondary Resources:
Bloomfield: A Vedic concordance
Böhtlingk/Roth: Großes Petersburger Wörterbuch

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GRETIL - Goettingen Register of Electronic Texts in Indian Languages:
http://gretil.sub.uni-goettingen.de/gretil.htm