The Octagon Book
The book is a detailed history of the Octagon Society, produced some centuries after the demise of the society. It covers, in great detail, the various octagonal shaped buildings which the society erected for the comfort and safety of distressed space-farers throughout the Regina, Lanth, and Rhylanor Subsectors. 
Many copies are water-stained and this well-worn volume is marked with an octagon on the binding. Estimated street value is often placed around Cr30 although a volume in good condition can fetch many times that price.