The collection includes the Corporation Counsel papers, business and personal correspondence, and family papers of Colonel William Hubbell Emerson of Rochester, retired Corporation Counsel for the city.

The Hooker Family Papers, 1790 to 1963 are arranged in five sections: correspondence, 1820 to 1930; financial and legal papers, 1790 to 1920; diaries and petty cash books, 1852 to 1926; miscellaneous papers, 1820 to 1963; and photograph albums, ca 1860's - 1890's. Sixteen of the twenty-seven boxes contain correspondence.

The collection includes the personal papers and correspondence of the Bradford King family of Rochester. Among the papers are the diaries of Bradford King, the son of Gideon King who settled near Rochester in 1797. Bradford left this area after his father's death in 1798, but returned many years later. The diaries cover the period from June, 1811 to April, 1874. During some years the entries are scattered or very brief; in others the notes are voluminous. Included in the correspondence are four volumes of letters from Bradford King to his brother Moses King. Also in the collection are the diaries and personal papers of Moses Bradford King, son of Bradford King, who was a prominent Rochester druggist. Moses Bradford King wrote and published a pamphlet which advocated changes in the calendar for the twentieth century. Much of the correspondence consists of letters written between the two daughters of Moses B. King, Ella G. King and Ada M. King. For a time Ella and Ada King operated the King Seminary for Young Ladies and Children in Rochester. When the school closed, Ella King went west and taught in an Indian school in South Dakota. Ada remained in Rochester where she tutored high school and college students. In 1944, at the age of 80, she enrolled for courses at the University of Rochester extension school, becoming the University's oldest co-ed. She died at the age of 100 in 1964.

Letters to and from the Huntington-Hooker family members and friends, chiefly personal in nature. Included are letters written by Albert Huntington and Horace Hooker during the Civil War, and their Civil War papers and documents; letters from Harriet Beecher Stowe and information on the Stowe Memorial Window which was installed in the church at Mandarin, Florida through the efforts of Susan Huntington Hooker; letters from Blanchette Hooker (Mrs. John D. Rockefeller III), Adelaide Hooker (Mrs, John P. Marquand), Elon Huntington Hooker and Frank Huntington. Also in the collection are diaries, survey maps, deeds, indentures, wills, mortgages, family financial papers; newspaper clippings about Rochester history and the Huntington-Hooker families, general clippings and articles from newspapers and magazines; articles and speeches by family members, cards, invitations; University of Rochester, Vassar and Cornell programs and bulletins; family scrapbooks, and miscellaneous memorabilia.

The Ellwanger and Barry Papers includes the records of Ellwanger and Barry Nursery to 1918, including correspondence, order books, sketchbooks, stock record books, catalogs, price lists, inventories, and account books; records of Ellwanger and Barry Realty Company to 1963, including financial and legal papers, account books, payroll records, and blueprints for houses on the Ellwanger and Barry tract. Also business and personal correspondence, account books, and financial records of Patrick Barry, Charles P. and Julia Wald Barry, Bernard and Harriet Barry Liesching, and Arthur A. Barry, including much information about Rochester banks and civic organizations. Also family photographs and scrapbooks; memorabilia; diaries of Patrick Barry, 1857-72; and record of soldiers' bounties, 1862-1863.

This collection, the Ward-Macomber Family Papers, 1829-1974, contains material relating to Levi Alfred Ward's son Levi Frederick Ward (1842-1907) and his family. On October 13, 1864 Levi Frederick Ward married Alice Smith (1844-1913). They had three children. Levi Smith Ward (1864-1926) married Florence Yates (1871-1931) in 1895. They had one son, Levi Yates Ward (b. 1904), who later changed his name to Andrew Lee Yates Ward. Laura Page Ward (1867-1959) married Francis Selden Macomber (1867-1956), a Rochester lawyer, also in 1895. Frederic Kemp Ward (1876-1910) married Hortense Thomas (1878-1909), the daughter of the architect John R. Thomas (1848-1901). Frederic Kemp and Hortense Ward had two children, Frederic Kemp Ward, Jr. (b. 1904) and Caroline Allen Ward (b. 1905). After their parents died, the children lived with their aunt and uncle, Laura Page and Francis Selden Macomber.

The Ellwanger Family Papers includes the letters, diaries, scrapbooks, personal financial papers, etc. of George Ellwanger, his wife Cornelia (Brooks) Ellwanger, and his children and grandchildren. Box 3 contains correspondence to Helen and Margaret Ellwanger (daughters of Edward S. and Leah Cresswell Ellwanger) variously addressed to them individually and jointly. Their correspondents include: Gertrude Jekyll, Marianne Moore, Gertrude Herdle Moore, William Robinson, and Fletcher Steele. Letters from the following have been indexed: Patrick Barry, Algernon Sidney Crapsey, George Eastman, David Jayne Hill, Henry O'Rielly, Mrs. Caroline (Erickson) Perkins, and Charles Sprague Sargent.

The Hastings Horticultural Papers provide insight into the business of setting up a nursery in Chicago, along with much information regarding the various types of trees and plants shipped westward from Rochester.

The collection includes the correspondence and other papers of William Channing Gannett (1840-1923), who was a Unitarian minister in St. Paul, Minnesota (1877-1883) and Rochester, N.Y. (1889-1908). The correspondence to and from Mr. Gannett includes letters from Jane Addams, Abigail May Alcott, Susan B. Anthony, Samuel Longfellow, Elihu Root, Alphonso and William Howard Taft, Booker T. Washington, Frank Lloyd Wright and many Unitarian leaders of the late 1800s and early 1900s. There are also letters relating to the Western Unitarian Controversy, the education of the freedmen at Port Royal, the temperance crusade, Unity magazine, Unitarian church organization and membership, and to the editing of Unity Hymns and Chorals by Mr. Gannett and Frederick L. Hosmer. About 400 letters, dated 1875-1912, were added to the collection by Charles H. Lyttle and relate to the Western Unitarian Controversy.