Yee-hawww! The Pony Rider Boys are on the trail again! In the second book of this series, Professor Zepplin has taken the young men to San Diego, Texas, to experience the life of a cowboy. The cattle drive will take them across the great state of Texas, where they will meet many dangers and adventures. (Summary by Ann Boulais) Previous book in the series: The Pony Rider Boys in the Rockies Next book in the series: The Pony Rider Boys in Montana