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in reply to So what is your Perl book "Trilogy" anyway?

I would say:

  1. Llama (Learning Perl)
  2. Camel (Programming Perl)
  3. Ram (Perl Cookbook)

For me, these sort of form a nice trilogy because each book has a different style. The Llama is a beginner's tutorial. The Camel is a reference book. And The Ram takes yet another approach with its recipe-style code listings and explanations. In combination, these three books give you three distinctive perspectives to help cover the basics of Perl.