[PRESIDENTS]. POLK, JAMES KNOX. Autograph letter signed as President, to P.R. Kendall, [Washington, D.C.], 1 April 1845, 1 page, 4to, integral blank, requesting Mr. Kendall forward a report concerning a court case to determine whether "there be any mitigating circumstances... which recommends the prisoner to Executive clemency..." -- VAN BUREN, MARTIN. Autograph letter signed to Mr. Corbin, n.p., 30 March 1855, 1 page, 8vo, scattered spotting (not affecting text), asking for a favor: "Will you have the goodness to convey the enclosed to the Rev[eren]d?" -- PIERCE, FRANKLIN. Autograph letter signed to Joel Munsell, Concord, New Hampshire, 25 March 1867, 1 page, 8vo, integral blank, acknowleding the receipt of a book, "Life of Red Jacket" -- BUCHANAN, JAMES. Autograph letter signed as Secretary of State, to General Jones, Washington, D.C., 6 May 1848, 1 page, 4to, integral blank, endorsing First Lieutenant Horace Haldeman and wondering if the General would allow Haldeman to "be transferred to the old regular army as a Second Lieutenant..."; together 4 items. (4)