Historic unsigned ten-volume book set: Abraham Lincoln: A History by John G. Nicolay and John Hay, Vols. I-X. First edition. NY: The Century Co., 1890. Hardcovers bound in green cloth with gilt lettering on spine and top edge gilt, 6.5 x 9.25. Book condition: VG/None, with ownership inscription to title page of Vol. I, some toning inside Vol. I from a laid-in newspaper clipping, cracked hinges to three volumes, and general rubbing and edgewear. A desirable complete set of Lincoln's definitive biography, authored by his esteemed personal secretaries.