The original Hardy Boys series
20. Mystery of the Flying Express
   
         
   

Original: 1941, 217 pages

Revised: 1970, 177 pages

Revision type: New story, new ideas

Cover art

Volume 20
1941

Volume 20
1962

Volume 20
1970
   
      Plot summary    
   
Coming soon
   
      Comparison of original and revised editions    
   
Coming soon
   
      Notes    
   
Coming soon
   
         
   

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