Expedition to the Barrier Peaks (S3), Greyhawk adventure for AD&D 1st ed, by Gary Gygax.
“This module was the official Advanced Dungeons & Dragons Tournament module at Origins II. the author wishes to express his thanks to Mr. Robert Kuntz who contributed substantial ideas for the various encounters herein. This version has been carefully revised and updated to conform to Advanced Dungeons & Dragons game systems. Included herein are backgrounded information for players, statistics for a party substantially the same as that used for the tournament, DM notes, six level maps with encounter matrices, and numerous full colour illustrations of scenes from the adventure in order to enhance the enjoyment of participants. There are also many new and special monsters designed for this scenario, and they appear nowhere else. This module is located upon the Map of the World of Greyhawk (World of Greyhawk Fantasy Setting from TSR).”
Possibly the oddest of the early AD&D modules. Our typical fantasy heroes encounter a crashed alien spaceship! For character levels 8-12.