| 1873 | |  Proceedings of the Twelfth and Thirteenth General Convention of the Fenian Brotherhood (handwritten) |
| March | Letter from C. McManus to John O'Mahony, May 17, 1873 |
| June | Letter from John O'Mahony to John McCafferty, June 13, 1873 |
| | Letter from J. Oters to Jeremiah O'Donovan Rossa, July 13, 1873 |
| | Letter from Mick J. Bourke, June 21, 1873 |
| August | Constitution and bylaws of the Fenian Brotherhood : as adopted at the Twelfth General Convention, held in the city of New York, August, 1873 |
| 1874 | | Constitution and bylaws of the Fenian Brotherhood : as adopted at the Thirteenth Annual Convention, held in the city of New York, 1874 |
| February | Letter from Michael Cavanagh to John W. Keogh, February 13, 1874 |
| March | Letter from Michael Cavanagh to John O'Mahony, March 5, 1874 |
| | Letter from Michael Cavanagh to John O'Mahony, March 13, 1874 |
| May | Letter from John Kenealy to Jeremiah O'Donovan Rossa, May 3, 1874 |
| | Letter from John O'Daly to John O'Mahony, May 13, 1874 |
| August | Letter from John O'Mahony to Jeremiah O'Donovan Rossa, August 12, 1874 |
| December | Letter from John Mitchel to Jeremiah O'Donovan Rossa, December 8, 1874 |
| 1875 | March | Letter from Patrick Ford to Jeremiah O'Donovan Rossa, March 22, 1875 |
| July | Letter from John O'Mahony to members of the Fenian Brotherhood, July 28, 1875 |
| September | Minutes from a Committee of the General Halpine Circle, Fenian Brotherhood, Harlem, New York, September 1, 1875. |
| | Minutes from a second Committee meeting of the General Halpine Circle, Fenian Brotherhood, Harlem, New York, September 6, 1875. |
| | Letter from Martha to John O'Mahony, September 26, 1875 |
| October | Minutes from the Committee of Safety, Thomas Davis Circle, Fenian Brotherhood, October 3, 1875. |
| 1876 | | Constitution and bylaws of the Fenian Brotherhood : as adopted at the Fourteenth General Convention, held in the city of New York, 1876 |
| March | Letter from John McCafferty to Jeremiah O'Donovan Rossa, March 27, 1876 |
| April | Letter from J. Edward Kelly to Jeremiah O'Donovan Rossa, April 8, 1876 |
| | Letter from John O'Mahony to members of the Fenian Brotherhood, April 28, 1876 |
| October | Letter from Charles Joseph Kickham to Jeremiah O'Donovan Rossa, October 9, 1876 |
| November | Letter from John Wm. Curry to John O'Mahony, November 17, 1876 |
