These commemorative collections of essays in honor of senior scholars and are often the best or only place to find a complete bibliography of an art historian's writings. Many classic essays (e.g. Panofsky's "Imago Pietatis") first appeared in Festschriften, and many of these essays have never been reprinted. (In the Fine Arts stacks, prior to those cataloged in 2010, they are usually classed at N 5302...)
Rave, P.O. Kunstgeschichte in Festschriften. (1962)
Coverage to 1960.
Avery Reference N35 R19
Rounds, D., ed. Articles on Antiquity in Festschriften. (1962)
Butler Reference R016.93 R76