A classic work on the South Caucasus, Kazemzadeh's book has been the standard survey of this period for decades, with nothing coming close to challenging it. The minute detail he includes gives the book an important scope that moves almost daily at time, and allows for a close understanding of an important part of history in the region.
He tries to give the three republics of Armenia, Azerbaijan, and Georgia equal coverage, but due to the circumstances on the ground that doesn't always happen, with a preponderance towards Georgia, but that is not for lack of trying. He remains relatively neutral throughout, and despite a clear bias against the Bolsheviks mainly states facts; when he does give an opinion on something, it is quite apparent, and thus makes for a clear reading.
It is above all a political history of the region, and while it briefly covers military engagements and the economic situation, is not focused on those (or other) topics. However with a copious bibliography, including key documents of the era, it does give a good outlook on how to find other details on the Caucasus, and rightfully still serves as a foundational text today.