From the Introduction:
"This product is the first in a series of Judges Guild general Science-Fiction role-gaming aids. Named Port o' Call, the series is designed to provide seberal ready-made starport towns, complete with detailed floor plans of all buildings and a detailed population of inhabitants. The initial series emphasizes the small starports of the kind most likely to be found on the frontier regions or in neglected back-waters, areas where player characters are most likely to begin adventuring."
Module includes sourcebook with a 12-page centre pullout of floor plans, a map of the planet Tarlkin, and a 22 x 34 inch map of the town as well as the larger buildings.