Abraham Lincoln: A History (Volume 9) by John Hay (1835 - 1905) and John George Nicolay (1832 - 1901)

Abraham Lincoln: A History is an 1890 ten-volume account of the life and times of Abraham Lincoln, written by John Nicolay and John Hay, who were his personal secretaries during the American Civil War. Volume 6 chronicles Lincoln's life in 1864, including the battles of that summer and Lincoln's reelection. (Summary adapted from wikipedia by Ann Boulais)