Architectural drawings for buildings designed by Hamlin including proposed alterations for the Charles Dudley Warner House, circa 1885; pumping station Clear Stream (or Clear Stream Station), Long Island, 1886; American Classical School, Athens, Greece, 1886-1888; proposed cottage for Mrs. R. Hoe at Sea Cliff, Long Island, 1887; an addition to Clinton Hall at Blair Presbyterian Academy, Blairstown, New Jersey, circa 1896; Soldier's Monument, Whitinsville, Massachusetts, circa 1904 (Hamlin was the architect and Herman A. MacNeil was the sculptor); and miscellaneous and unidentified structures. Also included are drawings done by Hamlin while a student at the Massachusetts Institute of Technology, 1876-1877; sketches done by Hamlin on travels both in the United States and abroad, 1867-1923; photographs of various unidentified buildings and architectural drawings; manuscripts of "ARCHITECTURAL SHADES AND SHADOWS" with related drawings"History of American Art" (unfinished, in French), circa 1923, and "MODERN ARCHITECTURE AND THE CRITICS" circa 1923. Personal materials included undated photographs of A.D.F. Hamlin; a photograph of an 1835 portrait of Cyrus Hamlin; a volume containing condolences, 1926, on the occasion of A.D.F. Hamlin's death; and a scrapbook"Memoirs of Amherst, Class of '75" containing programs, invitations, clippings, notes, essays, exam questions, steamship passenger lists, and other materials.

This collection contains predominantly early 19th-century prints of architecture, cityscapes, and landscapes, with some ethnographic views, in the United Kingdom, continental Europe, and other selected countries. The majority of images are from published sources and are uncolored. Nearly all the prints are titled and most include artist, printer, and/or publisher information. Many noted printmakers are represented in this collection, most of whom were British.

The collection of historical photographs and lithographs of New York City consists of about 3,000 items dated from the 1850s until the 1980s. The collection is made up of color photographic prints, color negatives, black-and-white photographic prints, black-and-white negatives, copy prints, studio and cabinet cards, stereo cards, cyanotypes, albumen prints, gelatin silver prints, lantern slides, glass negatives, and Polaroid prints, lithographs, woodcuts, tear sheets, and engravings. The collection also includes official images, newspaper images, and candid images. Also included are images from the photo morgue of the New York Herald-Tribune newspaper, which ceased publication in 1966. Other images were purchased as copies from New-York Historical Society, Museum of the City of New York, WNYC-FM Radio, the Bettman Archive, and from collectors, private vendors, and other institutions. Photos by noted photographers are included.