Series I. Correspondence is separated into correspondence written by Mary Abigail Dodge to editors, friends, and fans, and correspondence sent to Mary Abigail Dodge. Subseries A. Correspondence from Mary Abigail Dodge mostly concerns the publication of her work, discussing article topics, pay, etc. There are few letters concerning her political or moral views, although an 11 January 1869 letter to Fessenden discusses women's suffrage, and there is a series of letters in 1889-91 to the wife of President Benjamin Harrison concerning two criminal cases. Typed transcripts of these letters to Mrs. Harrison will be found in Box 1, Folder 14.

Subseries B. Correspondence to Mary Abigail Dodge spans the years 1856 to 1896. It includes such items as a letter from John S. C. Abbott asking Dodge for a chapter on emancipation for his book on the Civil War; a number of letters expressing enthusiasm over women's rights (a view with which Dodge was not in total agreement); a letter from William Lloyd Garrison discussing politics in the United States; a letter from Benjamin F. Butler asking Dodge to be on the Board of the State Work House, a reformatory in Bridgewater, Massachusetts, for poor and unfortunate women; and a letter from Lloyd Bryce at The North American discussing publishing, and praising Dodge's writings. A letter from Rose Hawthorne gives a muffin "receipt" (recipe). A letter from Una Hawthorne was written very shortly after her father's death, commenting on how the family was just beginning to deal with his death. There are nearly twenty letters from Sophia Hawthorne (the entire Hawthorne family were friends with Dodge), one written shortly after Nathaniel's death, in which Sophia's interest in Spiritualism is clear, and a series written during the summer of 1868 concerning Sophia's problems with the publishing firm of Ticknor & Fields. A July 12, 1868 letter of Sophia's makes clear her view about women's rights, which she was not in favor of.

Many letters deal with Mary A. Dodge's interest in the murder trial of Mrs. Maybrick in Great Britain. A letter from Oliver Wendell Holmes Jr. describes his desire not to take a stand on the Maybrick case. A letter from William P. Frye, in the Senate in Washington, discusses the annexation of Hawaii and the digging of the Nicaragua Canal. Many of the letters grant Dodge permission to quote from letters sent by them to James G. Blaine in her Biography of James G. Blaine. A number of letters in 1895 were addressed to Miss H. Augusta Dodge, who was caring for her sister after Mary's stroke. A letter at this time from John S. Sewall of the Bangor (Maine) Theological Seminary requested a letter back from Dodge in which she would describe what it was like to almost die and what her impression of heaven was.

A complete list of correspondents will be found in Appendix I.