The collection consists of approximately 5000 early 20th-century American architectural drawings (blueprint and trace drawings), primarily by C. Grant La Farge and various firms with which he was associated, including Heins & La Farge, La Farge, Clark & Creighton, La Farge, Warren & Clark, La Farge & Morris, and La Farge & Son. There are also groups of drawings by the architects Wilson Eyre, Pennington Satterthwaite (Princeton Class of 1893), Robert Gibson, and a few miscellaneous firms.

La Farge's drawings (1896-1931) represent churches, homes, instituions, boathouses, and mausoleums, including plans for the Cathedral of St. John the Divine (New York City), St. Matthews Cathedral (Washington, D.C.), the U.S. Naval Hospital (Brooklyn), Caspar Whitney's home in Irvington, N.Y., and J. P. Morgan, Jr.'s home in Matinecock Point, N.Y. For Wilson Eyre, a noted Philadelphia architect, there are drawings (1903-1932) for Walter Jefford's house in Conn., and various other buildings. Satterthwaite's works (1901-1927) include architectural plans for the Princeton Club (New York City), the Nassau Club (Princeton), the boathouse at Princeton University, and A. C. Hencken's home in Greenwich, Conn. Also present are drawings and prints used by Robert W. Gibson in the competition for the plans of the Cathedral of St. John the Divine in N.Y., and miscellaneous drawings by Carrere & Hastings, D. H. Faia, Robert Walters, C. P. Gilbert, and others.