Dating from the 1790s through 1970, the Lincklaen/Ledyard collection in the Lorenzo archive contains correspondence, land records, wills, maps, store and personal account ledgers, photographs, ephemera, and more created, collected or relating to the family members, enslaved, servants, and business and personal associates.

The deClercq Family Papers contain correspondence, land papers, documents, and photographs of the deClercq Family and their direct descendants, The Kingsbury and The Mather Families.

The Meadows collection is comprised of documents, papers, and photographs collected by the families that owned The Meadows mansion in Cazenovia, NY. These families include The Ledyards, The Hubbards, and The Oakmans, providing a snapshot of the personal life of an upper class family during the mid 1800s to the 1950s. Please see the scope and content note for a more in depth description of the collection.

Scrapbooks including topics related to the history of Schenectady, NY, with particular emphasis on the history of railroads, the Mont Pleasant neighborhood, the Westinghouse family and company, local schools and churches, and the YMCA.

Correspondence, legal documents, financial records, and memorabilia concerning the Holland Land Company, Colonel John Lincklaen, Jonathan Denise Ledyard, Helen Ledyard Lincklaen, Jane Strawbridge Ledyard, other Ledyard and Lincklaen family members, and Lorenzo mansion in Cazenovia. Photocopies and microfilm only, no originals.

The John E. Wyman Collection consists primarily of material relating to the early history of New York and some material relating to Connecticut. The collection includes a variety of manuscripts (1695-1917; bulk 1750-1840) collected and organized by John E. Wyman of Fonda, N.Y. The New York State Historical Association purchased the collection from the Wyman family in 1950. With the manuscripts, NYSHA acquired a calendar, probably compiled by John Wyman, which includes transcriptions and/or descriptions of more than 1,000 of the 1,100 plus documents originally in the collection.

The Duer Family papers include correspondence, diaries, genealogical manuscripts and notes, miscellaneous poetry, and early photographs, daguerreotypes, tintypes, engravings, and illustrations (the Duer coat of arms). The collection depicts aspects of social customs in Old New York, patriotism, and life abroad.

Architectural drawings and specifications for Codman's projects, circa 1890s-1930s, including the Martha Codman house in Washington, D.C.; alterations for Edith Wharton and her husband at their three residences, the Mount in Lenox, Mass., Land's End in Newport, R.I., and their Park Avenue home in New York City; work for the Thayer family of Boston, Mass., specifically Nathaniel Thayer's three homes in Boston, Lancaster, Mass., and Newport, R.I. ("Edgemere"), Bernard Thayer's Beacon Hill houyse in Boston, and Eugene Van Rensselaer Thayer's two houses in Boston and Lancaster, Mass.; the Lucy Dahlgren house in New York City; the Archer M. Huntington house on Fifth Avenue in New York City; interior design for John D. Rockefeller in his house "Kykuit" at Pocantico Hills, N.Y.; interior design work for the Vanderbilt family including Cornelius Vanderbilt's "Breakers" at Newport, R.I. and Frederick William Vanderbilt's mansion in Hyde Park, N.Y. and his house on Fifth Avenue in New York City; Oliver Ames' mansion at Pride's Crossing, Beverly, Mass., and his house in Boston; and interior decoration and alterations for Codman's own homes in Newport, R.I. and Roslyn, N.Y. and his villa in France, "La Leopolda", at Villefranche-sur-Mer. Also, lists, descriptions, and postcards of French chateaux, with related correspondence, circa 1900s-1930s, relating to Codman's bibliography on the chateaux of France; and miscellaneous lists of houses in England and France, correspondence, and printed material.

This collection, which dates from 1740-2004, includes dozens of hand drawn maps, and maps with engravings, most of them originals, as well as bound atlases, representing the City of Hudson and its immediate surrounding area, including Columbia County and portions of adjacent counties as well as New York State. These items contain important information about the history of Hudson and the surrounding region – from insurance and railroad maps, topographical and geological maps, to bird’s eye view drawings and developmental proposals. The collection also includes maps that provide information about The Hudson River as a site of commerce, industry, travel, and tourism, as well as wildlife and residential life, since the settling of the city of Hudson. The collection features maps and bound atlases from a multitude of important historic publishers, including Beers, Ellis & Co.; H.H. Rowley & Co; F.W. Beers; Hudson River Sloop Clearwater; The Sanborn Map Company; and Frank E. Richards, among others.

An artificial collection comprised of correspondence, diaries, lecture notes, essays, administrative documents, minutes, and other documents related to Columbia University. Materials were created by or for students, alumni, faculty, administrators, staff, trustees, and honorary degree recipients.