William S. Jackson Papers, Part 1, Ms 0235, Box 1, Folder 1
Letter from Nathan Fiske (HHJ's father) to his daughter Ann, 1846; letter from Deborah Fiske (HHJ's mother) to her aunt, 1828

William S. Jackson Papers, Part 1, Ms 0235, Box 1, Folder 7
Letters between WSJ amd HHJ ("Peggy"), 1874-1884

William S. Jackson Papers, Part 1, Ms 0235, Box 1, Folder 8
Letters from William S. Jackson to HHJ (then Helen Hunt), 1875

William S. Jackson Papers, Part 1, Ms 0235, Box 1, Folder 9
Letters between William S. Jackson and HHJ, 1880.

William S. Jackson Papers, Part 1, Ms 0235, Box 2, Folder 12
Letters between HHJ's niece Helen Fiske Banfield and William S. Jackson, often discussing HHJ, 1884-1885

William S. Jackson Papers, Part 2, Ms 0241, Box 3, Folder 24
Letters from Deborah Waterman Vinal Fiske (HHJ's mother, then Deborah Waterman Vinal) to her cousins Ellen and Ann Scholfield, 1823-1843

William S. Jackson Papers, Part 2, Ms 0241, Box 3, Folder 26
Letters from HHJ (then Helen Maria Fiske) to her cousin Ann Scholfield, 1844-1857

William S. Jackson Papers, Part 2, Ms 0241, Box 3, Folder 27
Letters from HHJ to her brother-in-law Everett C. Banfield, 1855

William S. Jackson Papers, Part 2, Ms 0241, Box 3, Folder 28
Letters from HHJ to her sister Ann, 1849-1858

William S. Jackson Papers, Part 2, Ms 0241, Box 3, Folder 29
Letters from HHJ to her sister Ann Banfield and letters from August Bachelder to HHJ, 1871-1872

William S. Jackson Papers, Part 2, Ms 0241, Box 3, Folder 30
Letters from HHJ to her cousin Ann Scholfield, her sister Ann Banfield, her husband William S. Jackson; 1874-1881; also manuscript notes and poems and a lock of HHJ's hair

William S. Jackson Papers, Part 2, Ms 0241, Box 3, Folder 31
Letters between HHJ and her cousin Ann ("Annie"), 1880-1884

William S. Jackson Papers, Part 2, Ms 0241, Box 3, Folder 34
Letters pertaining to HHJ's illness, August 1885

William S. Jackson Papers, Part 2, Ms 0241, Box 3, Folders 35-38
Letters on HHJ's death, August 1885; senders include Mary Mapes Dodge, T.W. Higginson, Thomas J. Niles, Sarah Woolsey, and many others

William S. Jackson Papers, Part 2, Ms 0241, Box 4, Folder 45
Anne Scholfield Fiske Banfield's Colorado Springs diary, 1894-1895

William S. Jackson Papers, Part 2, Ms 0241, Box 4, Folder 48
Letters from Anne S. Banfield to Helen Banfield, 1880, 1886-1887

William S. Jackson Papers, Part 2, Ms 0241, Box 5, Folder 55
Everett Colby Banfield's Harvard diary, 1846

William S. Jackson Papers, Part 2, Ms 0241, Box 7, Folder 83
Edith Colby Banfield's diary of caring for her nieces and nephews, 1900

William S. Jackson Papers, Part 2, Ms 0241, Box 9, Folder 101
Letters from Sarah Woolsey to William S. Jackson and Helen Banfield Jackson, 1885-1892.

William S. Jackson Papers, Part 2, Ms 0241, Box 13, Diary 1
1876-1877 diary of HHJ's niece Helen Fiske Banfield, later Helen Banfield Jackson

William S. Jackson Papers, Part 2, Ms 0241, Box 13, Diary 2
1886 diary of HHJ's niece Helen Fiske Banfield, later Helen Banfield Jackson

William S. Jackson Papers, Part 2, Ms 0241, Box 13, Diary 3
1887 diary of HHJ's niece Helen Fiske Banfield, later Helen Banfield Jackson

William S. Jackson Papers, Part 2, Ms 0241, Box 13, Diary 4
1888 diary of HHJ's niece Helen Fiske Banfield, later Helen Banfield Jackson

William S. Jackson Papers, Part 2, Ms 0241, Box 13, Diary 5
1889 diary of HHJ's niece Helen Fiske Banfield, later Helen Banfield Jackson

William S. Jackson Papers, Part 2, Ms 0241, Box 13, Diary 14
1898 diary of HHJ's niece Helen Fiske Banfield, later Helen Banfield Jackson

William S. Jackson Papers, Part 2, Ms 0241, Box 13, Diary 15
1899 diary of HHJ's niece Helen Fiske Banfield, later Helen Banfield Jackson

Jackson-Emery Papers, Ms 0397, Box 1, Folder 1
15 letters from Helen Hunt Jackson to “Mother” (her mother-in-law) and “Maggie” (her sister-in-law Margaret B. Jackson), 1880-1885, with a letter from William S. Jackson to his sister Hannah, August 5, 1885 describing HHJ’s illness and impending death.

Jackson-Emery Papers, Ms 0397, Box 3, Folder 6
Letters from John Dos Passos to Roland Jackson, 1917, 6 letters and postcards. Discusses travels in Madrid, Bordeaux, and elsewhere.

Helen Hunt Jackson letters in other collections at Colorado College (Mf 0126, Ms 0005, Mf 0366, Colorado Room PS2107 .C46 1885)
HHJ to William Ward, 1871; HHJ to Kilpatrick & Brown, 1878; HHJ to Mr. Marvin, 1879; HHJ to Mrs. Stedman, 1880.

Helen Hunt Jackson letters to Charlotte Cushman at the Library of Congress

Helen Hunt Jackson letters in private collections
HHJ to Susie B. Skelding, 1884; HHJ to J.R.Osgood & Co., undated; HHJ to "Dear Sir," August 7, 1874; HHJ to Dr. Sanger, undated.