(For a complete description of Repository searches, see Table of Repositories Searched.)
| Abbreviation | Repository Name and Location |
| AzCaF | Fort Verde State Historic Park, Camp Verde, AZ |
| AzTeS-L | Arizona State University, College of Law Library, Tempe, AZ |
| CLACCP | Clark County, Ohio, Court of Common Pleas, Springfield, OH |
| CLjC | The James S. Copley Library, LaJolla, CA |
| CoU | University of Colorado, Boulder, CO |
| CRedlL | The Lincoln Shrine, Redlands, CA |
| CSmH | Henry E. Huntington Library, San Marino, CA |
| CtY-BR | Yale University, Beinecke Rare Book & Manuscript Library, New Haven, CT |
| CU-L | University of California, Berkeley, Law Library, Berkeley, CA |
| DeU-W | University of Delaware, Goodstay Center, Wilmington, DE |
| DeWHa | Hagley Museum & Library, Wilmington, DE |
| DGU | Georgetown University, Washington, DC |
| DLC | Library of Congress, Washington, DC |
| DNA | National Archives and Records Administration, Washington, DC |
| DP | United States Patent Office, Arlington, VA |
| DUSC | United States Supreme Court Library, Washington, DC |
| DUTSC | Supreme Court of Dutchess County, Poughkeepsie, NY |
| GAU | Atlanta University, Atlanta, GA |
| IaCrM | Iowa Masonic Library, Cedar Rapids, IA |
| IaDaPM | Putnam Museum of History and Natural Science, Davenport, IA |
| IaGG | Grinnell College, Grinnell, IA |
| IAl | Hayner Public Library, Alton, IL |
| IAurHi | Aurora Historical Society, Aurora, IL |
| IBelHi | St. Clair County Historical Society, Belleville, IL |
| I-Ar | Illinois State Archives, Springfield, IL |
| IaU | University of Iowa Library, Iowa City, IA |
| IBloHi | McLean County Historical Society, Bloomington, IL |
| IC | Chicago Public Library, Chicago, IL |
| ICarbRAD | Illinois Regional Archives Depository, Southern Illinois University, Carbondale, IL |
| ICarlHi | Macoupin County Historical Society, Carlinville, IL |
| ICharRAD | Illinois Regional Archives Depository, Eastern Illinois University, Charleston, IL |
| ICHi | Chicago Historical Society, Chicago, IL |
| ICL | Loyola University, Chicago, IL |
| ICN | Newberry Library, Chicago, IL |
| ICNA | National Archives and Records Administration, Great Lakes Region, Chicago, IL |
| ICU | University of Chicago Library, Department of Special Collections, Chicago, IL |
| IDanHi | Vermilion County Museum, Danville, IL |
| IDecHi | Macon County Historical Society, Decatur, IL |
| IDecJ | James Millikin University Library, Birks Museum, Decatur, IL |
| IDekRAD | Illinois Regional Archives Depository, Northern Illinois University, Dekalb, IL |
| IEdS | Southern Illinois University at Edwardsville Library, Edwardsville, IL |
| IEdwHi | Madison County Historical Society, Edwardsville, IL |
| IEN-L | Northwestern University School of Law, Chicago, IL |
| IG | Galesburg Public Library, Galesburg, IL |
| IGK | Knox College, Galesburg, IL |
| IJI | Illinois College, Jacksonville, IL |
| IHi | Abraham Lincoln Presidential Library, Springfield, IL |
| ILinLM | Lincoln College Museum, Lincoln, IL |
| IMacoRAD | Illinois Regional Archives Depository, Western Illinois University, Macomb, IL |
| InFtwL | Lincoln Museum, Ft. Wayne, IN |
| InHi | Indiana Historical Society, Indianapolis, IN |
| InIB | Butler University, Indianapolis, IN |
| INRAD | Illinois Regional Archives Depository, Illinois State University, Normal, IL |
| InTV | Vigo County Public Library, Terre Haute, IN |
| InU-Li | Indiana University, Lilly Library, Bloomington, IN |
| IParHi | Edgar County Historical Society, Paris, IL |
| IPB | Bradley University, Cullom-Davis Library, Peoria, IL |
| IPetHi | Menard County Historical Society, Petersburg, IL |
| IQHi | Historical Society of Quincy and Adams County, Quincy, IL |
| IS | Springfield, IL (Municipal Records, City Clerk's Office) |
| ISBaOn | Bank One, Springfield, IL |
| ISL | Lincoln Library, Sangamon Valley Collection, Springfield, IL |
| ISR | Sangamon County Recorder's Office, Springfield, IL |
| ISRAD | Illinois Regional Archives Depository, University of Illinois at Springfield, Springfield, IL |
| IU-HS | Illinois Historical Survey, University of Illinois Library, Urbana, IL |
| IU-L | University of Illinois Library, Lincoln Room, Urbana, IL |
| IUr | Urbana Free Library, Champaign County Historical Archives, Urbana, IL |
| JTMU | Tokyo Lincoln Center, Meisei University, Tokyo, Japan |
| KLeS | St. Mary's College, Leavenworth, KS |
| Ky-Ar | Kentucky Department for Libraries and Archives, Kentucky State Archives, Frankfort, KY |
| KyBB | Berea College, Berea, KY |
| KyLxMTL | Mary Todd Lincoln Home, Lexington, KY |
| KyU | University of Kentucky, King Library, Lexington, KY |
| LU | Louisiana State University Library, Baton Rouge, LA |
| MBJFK | John F. Kennedy Library and Museum, Boston, MA |
| MBU | Boston University, Mugar Memorial Library, Boston, MA |
| MeWC | Colby College, Waterville, ME |
| MH-H | Harvard University, Houghton Library, Cambridge, MA |
| MHi | Massachusetts Historical Society, Boston, MA |
| MH-L | Harvard University, Law School Library, Cambridge, MA |
| MiAllG | Grand Valley State University, Allendale, MI |
| MiD | Detroit Public Library, Detroit, MI |
| MiD-B | Burton Historical Collection, Detroit Public Library, Detroit, MI |
| MiDbEI | Edison Institute, Henry Ford Museum, Dearborn, MI |
| MiPlyHi | Plymouth Historical Museum, Plymouth, MI |
| MiU-H | University of Michigan, Bentley Historical Library, Michigan Historical Collections, Ann Arbor, MI |
| Mo-Ar | Missouri State Archives, Jefferson City, MO |
| MoCoJ | Western Historical Manuscript Collection, University of Missouri, Columbia, MO |
| MoKSStL | St. Luke's Hospital of Kansas City, Kansas City, MO |
| MoSHi | Missouri Historical Society, St. Louis, MO |
| MoSMJ | Midwest Jesuit Archives of St. Louis, St. Louis, MO |
| MoSW | Washington University, St. Louis, MO |
| MWeA | Westfield Athenaeum, Westfield, MA |
| MWiW-C | Williams College, Chapin Library, Williamstown, MA |
| N | New York State Library, Albany, NY |
| NhD | Dartmouth College, Hanover, NH |
| NIC | Cornell University, Ithaca, NY |
| NjMoHP | Morristown National Historic Park, Morristown, NJ |
| NjP | Princeton University Library, Department of Rare Books and Special Collections, Manuscript Division, Princeton, NJ |
| NN | New York Public Library, New York, NY |
| NNC | Columbia University, New York, NY |
| NNPM | Pierpont Morgan Library, New York, NY |
| NRU-A | University of Rochester, Memorial Art Gallery, Rochester, NY |
| NSkan | Skaneateles Library Association, Skaneateles, NY |
| OC | Public Library of Cincinnati and Hamilton County, Cincinnati, OH |
| OClW | Case Western Reserve University, Cleveland, OH |
| OClWHi | Western Reserve Historical Society, Cleveland, OH |
| OFH | Rutherford B. Hayes Presidential Center, Fremont, OH |
| OHi | Ohio Historical Society, Columbus, OH |
| OkHi | Oklahoma Historical Society, Oklahoma City, OK |
| OO | Oberlin College, Oberlin, OH |
| OrU | University of Oregon, Eugene, OR |
| Phi | Historical Society of Pennsylvania, Philadelphia, PA |
| PMA | Allegheny College, Meadville, PA |
| PP | Free Library of Philadelphia, Philadelphia, PA |
| PPPrHi | The Presbyterian Historical Society, Philadelphia, PA |
| PPRF | Rosenbach Foundation, Philadelphia, PA |
| PU | University of Pennsylvania, Philadelphia, PA |
| RPB-JH | Brown University, John Hay Library, Providence, RI |
| THaroL | Lincoln Memorial University, Abraham Lincoln Library and Museum, Harrogate, TN |
| TxAuHRH | Harry Ransom Humanities Center, University of Texas, Austin, TX |
| UPB | Brigham Young University, Provo, UT |
| ViHi | Virginia Historical Society, Richmond, VA |
| WaHi | Washington State Historical Society, Tacoma, WA |
| WBHi | Beloit Historical Society, Beloit, WI |
| WHi | State Historical Society of Wisconsin, Madison, WI |
| WJaHi | Rock County Historical Society, Janesville, WI |
| WPlaU | University of Wisconsin-Platteville, Karrmann Library, Platteville,WI |