Drawings, prints, watercolors, photographs, and reproductions, largely undated (late 19th- through the 20th century) of architectural and other subjects by Harriman, with some by others including Perry Coke Smith, Howard J. Custer, and unidentified artists and architects. Of note is an undated unidentified photograph of late 19th- or early 20th-century art or architecture students.

Photographs and architectural drawings of Lienau's work, much of it in New York City and in New Jersey. Projects include the Gardner A. Sage Library for the General Theological Seminary in New Brunswick, N.J.; the Francis Cottenet Villa in Dobbs Ferry, N.Y.; a house for Legrand Lockwood in South Norwalk, Conn., later owned by Mark Twain and now known as the Lockwood-Mathews Mansion; and the Telfair Academy of Arts and Sciences in Savannah, Ga. Also included are drawings of unidentified or unexecuted buildings; student drawings, and early European commissions; lecture notes, 1835-1837, from the Stadtische Gewerbeschule, Berlin; a partial list of of Lienau's work, 1848-1886; specifications; acounts; printed material; photographs, postcards, and prints showing various European buildings; clippings; certificates; typescripts of articles; and correspondence.

This collection includes Giorgio Cavaglieri's preliminary studies, working drawings, presentation drawings, and specifications, circa 1962-1965, for his renovation of the Jefferson Market Courthouse into a library. Also, prints of drawings, 1876, by Vaux and Withers for the original building, and drawings, circa 1918-1940, for alterations.