The Golden Meadows (Swords & Wizardry)

From publisher blurb: In a windswept valley of scrub and sand there is a pleasant meadow fed by a bubbling spring. Here the wandering folk have made their home, a fort of adobe under the blazing sun. From this place in the middle of nowhere one might join the prospectors in the mountains searching for silver, race against the mountain men in their search for the fabled Caverns of the Old Ones or just explore the many secrets and dangers hiding beneath the burning sands.