klingon_story1-5  Exercise 1: Okrand's Works
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  1985  The Klingon Dictionary            the base language
  1992  Dictionary addendum                new grammar, ~200 words
  1992  Conversational Klingon (audio)     spoken practice
  1993  Power Klingon (audio)              spoken practice
  1996  The Klingon Way                    157 proverbs with explanations
  1997  Klingon for the Galactic Traveler  companion phrasebook

The audio courses' contents are not described in the sources used, so "spoken
practice" is the description from their format, not from a check of the tapes.