| First published by A.L Burt, this series was later reprinted by World
    Syndicate. | 
        THE MYSTERY BOYS AND THE INCA GOLD -- 1931. A.L. Burt; World
          Syndicate.
 
THE MYSTERY BOYS AND CAPTAIN KIDD'S MESSAGE -- 1931. A.L.
          Burt; World Syndicate.
 
THE MYSTERY BOYS AND THE SECRET OF THE GOLDEN SUN -- 1931.
          A.L. Burt. World Syndicate.
 
THE MYSTERY BOYS AND THE CHINESE JEWELS -- 1931. A.L.
          Burt;  World Syndicate.
 
THE MYSTERY BOYS AND THE HINDU TREASURE -- 1931. A.L. Burt;
          World Publishing. |