De geheimzinnige vijand 

• 1952 
• 4 
• Blauwe Sperwer, De 
• Dupuis publications SC [Dutch] 

The original records 2, 3, and 4 are not included in this album. Not even in the later reissue in the Youth Sins series. Only seen in the numbers 500, 501 and 502 of Spirouweekblad (1949).

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