The original Hardy Boys series
13. The Mark on the Door
   
         
   

Original: 1934, 219 pages

Revised: 1967, 175 pages

Cover art

Volume 13
1934

Volume 13
1950

Volume 13
1967
   
      Plot summary    
   
Coming soon
   
      Comparison of original and revised editions    
   
Coming soon
   
      Notes    
   
Coming soon
   
         
   

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