| 
 
 | 
  
  Peirce, C. S. (nd). Letters to Christine Ladd-Franklin. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Letters to F. A. Woods. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Letters to F. C. S. Schiller. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Letters to Francis C. Russell. MS [R] L387. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Letters to Lady Welby. MS [R] L463. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Letters to William James. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Logic of Number [R]. MS [R] 23. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Logic of Number. MS [R] 39. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Logic of Quantity. MS [R] 19. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Logic of Quantity. MS [R] 20. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Logic: Fragments [R]. MS [R] S64. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Memoire sur la Logique de la Quantite. Deuxieme Partie. MS [R] 21. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Miscellaneous Fragments [R]. MS [R] 1573. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Miscellaneous Fragments [R]. MS [R] S104. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). Notes on B. Peirce's Linear Associative Algebra. MS [R] 78. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). On Classification of the Sciences. MS [R] 602. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). On Collections and Multitudes [R]. MS [R] 33. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). On Collections [R]. MS [R] 32. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). On Multitudes [R]. MS [R] 29. | Manuscript |  | 
          
                  | 
 
 | 
  
  Peirce, C. S. (nd). On the Basic Rules of Logical Transformation. MS [R] 516. | Manuscript |  |