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Avesta Language
http://www.farvardyn.com/avesta.htm
Its discovery and history of research.
Avestan Alphabet
http://www.omniglot.com/writing/avestan.htm
Origin, notable features, and GIF images of the letters.
Avestan Overview
http://www.avesta.org/alang.htm
Charts of noun cases and verb suffixes; link to graphemes and pronunciation.