Originally Posted by kennyc
The "Known Space" stories cover a much bigger universe than just the ring-world system.
He really created a whole background that is only partially revealed in Ringworld
World of Ptavvs is excellent as are the "Stories of Known Space"
Excellent observation. A prior reading of a the first couple of Man-Kzin War novels does wonders in understanding the crew visiting Ringworld and their interactions for the first of the Ringworld Books.