After nearly fifty years, the publication of Ulysses S. Grant's correspondence concludes with the appearance of The Papers of Ulysses S. Grant, Volume 32: Supplementary Materials. Following in the footsteps of the project's founding editor, John Y. Simon, and his numerous assistant editors, current managing editor John F. Marszalek and his team offer a volume of letters undiscovered during the publication of the earlier thirty-one...