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"An envoy on the alien world of Nor'Dyren finds out that the planet is ruled according to a very strict division of labour between the three native species: Allegon, Berregon and Gonnegon. The system seems however not to work properly, since Nor'Dyren is in decadence and paralyzed by an obtuse bureaucracy. Yet, the world was apparently in full development until a few centuries before. What's Nor'Dyren's secret? The final will be surprising."
Used availability for Sydney J Van Scyoc's Assignment Nor'Dyren
1973 : USA Mass Market Paperback