501 Adams, John | Establishing an American Army: John Adams introduces a congressional committee charged with meeting with General Washington “concerning various Matters of Importance”

502 Adams, John | A learned disquisition on the common law and natural rights and the roles those concepts played in Adams's own contributions to the Declaration of Independence and the founding of the United States

503 (Gettysburg) | “Genl. Doubleday has taken charge of the battle”: Abner Doubleday’s autograph witness to the first day of the Battle of Gettysburg, illustrated by fourteen insightful maps and plans

504 (Hamilton, Alexander, James Madison, and John Jay) | Bushrod Washington's Federalist, praised by George Washington as a "work [that] will merit the notice of Posterity"

505 Jefferson, Thomas | In a widely discursive letter, Jefferson announces that he is joining Washington’s cabinet and expresses great relief at the recovery of the President from a serious illness

506 Lincoln, Abraham | The President's letter to John Key—sent just four days after he issued the preliminary Emancipation Proclamation

507 Lincoln, Abraham | The President refutes rebel press propaganda about the siege of Vicksburg

508 Lincoln, Abraham | The President thanks a schoolboy on behalf of "all the children of the nation for his efforts to ensure "that this war shall be successful, and the Union be maintained and perpetuated."

509 McKenney, Thomas L., and James Hall | History of the Indian Tribes of North America, a royal subscriber's copy

510 Smith, John | The General History of Virginia... 1624

511 Virginia House of Delegates | The genesis of the Declaration of Independence and the Bill of Rights

512 Washington, George | An extraordinary pair of books from George Washington’s field library, marking the conjunction of three of the most consequential military figures of eighteenth-century America: Robert Rogers, George Washington, and Henry Knox

513 Washington, George | The commander in chief orders that Redcoat prisoners be treated "with humanity, and Let them have no reason to Complain of our Copying the brutal example of the Brittish Army"

514 Washington, George | An extraordinary letter marking the conjunction of three of the most consequential figures of the American Revolution: George Washington, the Marquis de Lafayette, and Benjamin Franklin

515 [World War II – 21st Army Group] | An important archive of maps and files documenting the allied campaign in Europe, from the early stages of planning for D-Day and Operation Overlord, to the German surrender