What is the difference between Cities of Harn and Son of Cities?
Son of Cities was originally published as an extension to the Cities of Harn book. It contained additional pages which could be added to the end of the seven city articles in Cities of Harn, mostly additional details of specific buildings. Later, the Cities of Harn and Son of Cities books were sold together under the name Cities of Harn. The Cities of Harn material is undergoing revision and expansion (possibly doubling in size), but the publication format and dates have not been set.