Correspondence, manuscripts of poems, and manuscripts of lectures by Benjamin. The correspondence consists of original letters of Benjamin, typescript and photostatic copies of Benjamin letters in other libraries, and letters to Benjamin from some of his literary contemporaries including Paul Hamilton Hayne, Willis Gaylord Clark, John Lothrop Motley, and Fitz-Greene Halleck. Many of the letters relate to Park Benjamin's lecture tours. There are other family letters and many documents relating to the Benjamin family,and two letterbooks of John Lothrop Motley. Also, a large amount of genealogical material of the Benjamin family, and its related families from the 16th century to the present day. There are also financial records, monographs, clippings, and photographs.

Letters from men outstanding in the scientific field, including Berzelius, Darwin, Faraday, Guericke, Helmholtz, Jenner, and Leibnitz. Some were presented to Dr. Herter by Henrietta Darwin Litchfield, daughter of Charles Darwin, and some by Paul Ehrlich to whome a number of the letters are addressed. Included in the collection is one page of the autograph manuscript of Darwin's ORIGIN OF SPECIES, authenticated by his daughter.

Letters and documents relating to the financial affairs of George Villiers, 2nd Duke of Buckingham. Addressed to Sir Robert Clayton, the letters and documents are from Edward Christian, Edward Bellamy, Anne Berington, Robert Chapman, the Marquis of Halifax, William Hardwick, John Morris, Thomas Redshawe, and Tobye Thurscros. They relate to mortgages, and lands and manors in Burton, Helmsley, and Burleigh, and mention Thomas Browne, Sir Thomas Hartopp, Lord Byron, Lord Belasyse, the Duke of Albemarle, and Lord Rutland.

A volume containing copies, probably in a secretary's hand, of 156 letters written by Milton when he was secretary to Oliver Cromwell. These are addressed to the various reigning monarchs of Europe, to Cardinal Mazarin, the Duke of Muscovy, Duke of Brandenburg, etc. The letters, with the exception of ten, are written in Latin. The first 20 pages of the manuscript contain a series of essays, some of which have been ascribed to Milton, others of which seem to be materials he used in his official duties.

Documents, letters, and papers relating to the ecclesiastical, political, and social history of Mexico. A large group of ecclestical material is dated 1772 while most of the secular papers fall in the early part of the 19th century. Of these documents 144 originated from archepiscopal authority and bear the signatures or seals of Manuel Barrientos (Vicar General and acting Archbishop), Andres Martinez Campillo (Canon of the Metropolitan Parish Church), Francesco Antonio Lorenzana (24th archbishop of Mexico), and others. These include about 67 dispensations in cases of marriage to avoid publishing the banns and to set aside degrees of consanguinity and affinity; a chronological list of the 31 archbishops of Mexico from 1527 to 1821; and wills and settlement of estates. Also, papers of Clemente de Jesús Munguía (1810-1868), Bishop of Michoacan. Among the material of less ecclesiastical nature there are letters and official communications relating to revolutionary leaders, 1811-1886, reports from viceregal archives, and tax assessments.

A collection of letters and documents pertaining to the American Revolution, or to personages who figured in it. Among the persons represented in the collection are John Adams, Edmund Burke, Aaron Burr, Lord Cornwallis, Benjamin Franklin, Nathanael Greene, John Hancock, Patrick Henry, John Jay, Thomas Jefferson, John Paul Jones, Marquis de Lafayette, Henry Brockholst Livingston, Robert Morris, William Pitt, Benjamin Rush, Baron von Steuben, and George Washington. The largest group of manuscripts in the collection is the sixteen letters of Henry Laurens, the South Carolina planter, and his son, John Laurens, among which is a magnificent "manumission letter" written by Henry Laurens to his son on 14 August 1776, barely a month after the signing of the Declaration of Independence. For the text of this letter see: A LETTER FROM HENRY LAURENS TO HIS SON JOHN LAURENS, AUGUST 14, 1776.

A collection of letters and documents pertaining to the American Revolution, or to personages who figured in it. Among the persons represented in the collection are John Adams, Edmund Burke, Aaron Burr, Lord Cornwallis, Benjamin Franklin, Nathanael Greene, John Hancock, Patrick Henry, John Jay, Thomas Jefferson, John Paul Jones, Marquis de Lafayette, Henry Brockholst Livingston, Robert Morris, William Pitt, Benjamin Rush, Baron von Steuben, and George Washington. The largest group of manuscripts in the collection is the sixteen letters of Henry Laurens, the South Carolina planter, and his son, John Laurens, among which is a magnificent "manumission letter" written by Henry Laurens to his son on 14 August 1776, barely a month after the signing of the Declaration of Independence. For the text of this letter see: A LETTER FROM HENRY LAURENS TO HIS SON JOHN LAURENS, AUGUST 14, 1776.

Manuscripts of, and historical documents collected by, Georgiĭ M. Kiselevskiĭ. Kiselevskiĭ's brief typed memoirs discuss his youth, service in the Imperial Ministry of Communications before World War I, and life as an emigre in Europe and Latin America. His diary from 1919-1920 covers the period when he served in the White Northwestern Army. Also included is a photograph and membership lists relating to emigre engineers' associations. Among the historical documents which Kiselevskiĭ collected are patents and edicts issued by the following Russian rulers: Alekseĭ Mikhaĭlovich (ruled 1645-76); Peter I (1682-1725); Catherine I (1725-27); Anna Ivanovna (1730-40); Ivan VI (1740-41); Catherine II (1762-96); and Alexander I (1801-25). Co-signers of certain of these documents are A.A. Arakcheev, V.V. Dolgorukiĭ, B.C. von Minikh, and A.D. Menshikov. Also included are over 50 miscellaneous receipts and other documents from the period 1732-1872. In addition there is a printed roll (stolbet︠s︡) depicting the order of march at Alexander I's funeral (1825).

The collection contains documents about land holdings in and around Yonkers and Westchester and Dutchess Counties, New York owned by the wealthy Philipse, Gouverneur, Verplanck, Livingston, and other allied families. Included are grants, patents, deeds, indentures, transfers, wills, leases, accounts, maps, and records of civil and chancery court actions. These records not only chronicle legal actions, riots and uprisings of the European colonial settlers related to land disputes against these wealthy colonial settler families, but also record their interactions with the true landowners the Wappinger Confederacy.

Autograph letters, official and private documents, and accounts, which were previously mounted in eleven volumes. Most of these relate to Columbia University or people associated with the University.