This series contains notebooks of all sizes generated by different Martindales from Stephen II through Stephen V and Katharine. The notebooks form a separate group because of their physical size and difficulties in exactly identifying which Martindale kept the notebooks. Furthermore, some notebooks were kept by more than one person and were used for more than one purpose. An attempt has been made to arrange the notebooks according to the principal family member who produced them, but users should remember that identifications are not certain.

Each notebook's owner(s), contents, and dates are provisionally indicated in pencil on the inside cover or on the first page. Oversized notebooks are identified as above and kept together in a separate large box which must also be examined in order to bring together all notebooks by one person. The notebooks include Stephen II's parish notes and records; later Martindales' business records and accounts for insurance companies, for other companies worked for or associated with, and for personal business affairs; household records and accounts; cashbooks; memoranda; an 1864 La Crosse poll list; La Crosse land abstracts; collections of notable quotations; diaries; autograph books; address books; scrapbooks; and others. One oversized scrapbook contains newspaper clippings which provide genealogical and personal information about Martindale relatives.