| | Date | Description | Location | MdHR No | MSA Citation |
| Details | 10/19/1849 | Letter, Henry G.S. Key to Gov. Philip F. Thomas | 01/06/03/007 | 40114-41 | S988-1 |
| Details | 10/24/1849 | Letter, John M. Clayton to Col J.D. Graham | 01/06/03/007 | 40114-42 | S988-2 |
| Details | 11/20/1849 | Letter, Col. J.D. Graham to Gov. Philip F. Thomas | 01/06/03/007 | 40114-43 | S988-3 |
| Details | 1850 | List of Documents borrowed by Col. J.D. Graham | 01/06/03/007 | 40114-44 | S988-4 |
| Details | 1850 | Message from Governor of Maryland transmitting Reports of Joint Commissioners and Lt. Col. Graham, re, Boundary Lines of Maryland, Pennsylvania, and Delaware | 01/06/03/001 | 17988 | S988-5 |
| Details | 1850 | Message from Governor of Maryland transmitting Reports of Joint Commissioners and Lt. Col. Graham, re, Boundary Lines of Maryland, Pennsylvania, and Delaware, 2nd copy | 01/06/03/001 | 17989 | S988-6 |
| Details | 02/15/1850 | Letter, Henry G.S. Key to Gov. Philip F. Thomas | 01/06/03/007 | 40114-45 | S988-7 |
| Details | 02/27/1850 | Report on the Intersection of the Boundary Lines of Maryland, Pennsylvania, and Delaware, Lt. Col. J.D. Graham | 01/06/03/001 | 17987 | S988-8 |
| Details | 02/28/1850 | Letter, Col. J.D. Graham to Henry G.S. Key | 01/06/03/007 | 40114-46 | S988-9 |
| Details | 03/04/1850 | Letter, Henry G.S. Key to Gov. Philip F. Thomas | 01/06/03/007 | 40114-47 | S988-10 |
| Details | 12/12/1860-12/02/1861 | Field Notes and Journal of Surveyors | 01/06/03/001 | 17983 | S988-11 |
| Details | 12/25/1869 | Letter, Howard Edwards to R.C. Hollyday | 01/06/03/007 | 40114-48 | S988-12 |
| Details | 02/19/1870 | Letter, James Veech to James C. Welling | 01/06/03/007 | 40114-49 | S988-13 |
| Details | 07/06/1886 | Letter, Silas Stevenson to Gov. Henry Lloyd | 01/06/03/007 | 40114-50 | S988-14 |
| Details | 03/20/1890 | Letter, Thomas J. Stewart to Edward W. Lecompte | 01/06/03/007 | 40114-51 | S988-15 |
| Details | 1903 | Report on Mason-Dixon Line Resurvey, Maryland Geological Survey | 01/06/03/007 | 40114-52 | S988-16 |
| Details | 04/19/1904 | Letter and Accounts of Capt. W.C. Hodgkins, William Bullock Clark to Gov. Edwin Warfield | 01/06/03/007 | 40114-53 | S988-17 |
| Details | 11/26/1980 | Agreement between DE and MD on Boundary Markers | 01/06/03/008 | 40265 | S988-18 |
| Details | 11/14/1985 | Agreement Between DE and MD, re Middle Point Boundary Marker | 01/06/03/008 | 50202-1 | S988-19 |
| Details | 12/04/1985 | Agreement Between DE and MD, re restoration of boundary markers | 01/06/03/008 | 50202-2 | S988-20 |
| Details | 08/26/1987 | Agreement between DE and MD, re Tangent segment of Mason-Dixon Line | 01/06/03/008 | 50202-3 | S988-21 |
| Details | 08/26/1987 | Agreement between DE and MD, re Arc segment of Mason-Dixon Line | 01/06/03/008 | 50202-4 | S988-22 |
| Details | 08/26/1987 | Agreement between DE and MD, North segment of Mason-Dixon Line | 01/06/03/008 | 50202-5 | S988-23 |
| Details | 04/21/1994 | Agreement between DE and MD, Arc segment of Mason-Dixon Line | 01/06/03/008 | | S988-24 |
| Details | 04/21/1994 | Agreement between DE and MD, North segment of Mason-Dixon Line | 01/06/03/008 | | S988-25 |
| Details | 04/21/1994 | Agreement between DE and MD, Tangent segment of Mason-Dixon Line | 01/06/03/008 | | S988-26 |
| Details | 04/21/1994 | Agreement between DE and MD, Transpeninsular segment of Mason-Dixon Line | 01/06/03/008 | | S988-27 |
| Details | 1850 | Message from Governor of Maryland transmitting Reports of Joint Commissioners and Lt. Col. Graham, re, Boundary Lines of Maryland, Pennsylvania, and Delaware, 3rd copy. | 01/06/03/001 | | S988-28 |
| Details | | unit not used | 00/00/00/000 | | S988-29 |