There are many, but no two have the same tastes, and I doubt anyone has read all the books featuring Klingons. At some future date I hope to make a comprehensive list of all such books, but then my aspirations toward glory tend to be derailed by reality.
The Memory Beta wiki used to have synapses of the Trek novels in the order in which they were published, but apparently it has been pulled in their attempts to keep up with Abramson’s retconning. To my surprise I was unable to find any traces of it using
The Wayback Machine.
I recommend you get your eyes on anything listed in the
Resources for Klingon Culture thread. To it I would add:
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Dwellers in the Crucible (Warning: this book portrays Klingons as the enemies they were originally intended to be)
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Star Trek Log Seven Though
Enterprise-heavy, this book gives us some interesting early insights into Klingon military sociology, and introduces us to the concept of the Surgeon-in-Battle eight years before John M. Ford brought the positions of Battle Surgeon and Surgeon Specialist to TFR. It also gives us a brief but tantalizing glimpse of the
nada, a healing spirit and “patron saint” of the medical profession.
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Doctor’s Orders Towards the end, McCoy is forced to face down a Klingon squadron. He may be a weak Human who could not fight his way out of a cellulose pouch, but there are few better when it comes to doing battle using what Thought Mistress Weatherwax would call “headology”. Also
Enterprise-heavy, this book gives us a few too-brief insights as to how various Klingon individuals feel about aliens.