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- Arthur, Robert, Three investigators, 10
- Arthur, Robert, Three investigators, 1
- The three investigators in The mystery of the fiery eye, by Robert Arthur
- The three investigators in The mystery of the whispering mummy, by Robert Arthur
- The three investigators in The mystery of the silver spider, by Robert Arthur
- The three investigators in The mystery of the screaming clock, by Robert Arthur. --
- The three investigators in The mystery of the green ghost, by Robert Arthur. --
- The secret of Terror Castle, by Robert Arthur
- The three investigators in The secret of Skeleton Island, text by Robert Arthur. --
- The three investigators in The mystery of the vanishing treasure, by Robert Arthur