2. THE ADVENTURE BOYS and the RIVER OF EMERALDS
With a guide, they set out to find the River of Emeralds. But masked foes, emeralds, and falling mountains are all in the day’s fun for these Adventure Boys.
3. THE ADVENTURE BOYS and the LAGOON OF PEARLS
This time the group starts out on a cruise simply for pleasure, but their adventuresome spirits lead them into the thick of things on a South Sea cannibal island.
4. THE ADVENTURE BOYS and the TEMPLE OF RUBIES
The Adventure Boys find plenty of thrills when they hit the ruby trail, and soon discover that they are marked by some sinister influence to keep them from reaching the Ruby.
5. THE ADVENTURE BOYS and the ISLAND OF SAPPHIRES
The paths of the young jewel hunters lead to a mysterious island where the treasures are concealed.
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