Biographical data, correspondence, notebooks, notes, writings, art work, sketchbooks, files, photographs, slides, sound recordings, and printed material. Included are biographical documents; correspondence with dealers, museums and others; numerous sketches; sketchbooks; working and presentation drawings; monoprints; photographs of Von Schlegell, his family, his father William Von Schlegell, and his work; albums of slides; files on Yale University and a Pace gallery exhibition, 1983; studio plans; bills for supplies; studies for a commission proposal; site plans; blueprints; exhibition material; clippings; writings by Von Schlegell and others; and legal and financial material. A diary kept by Von Schlegell's mother, Alice, 1914; and material relating to his father, William Von Schlegell, including a sound recording with transcript, 1991, of a talk about his work, biographical data, portfolio of sketches, a drawing of him, photographs of his work, a typescript of "Theories of Color," a priced checklist and catalog for a posthumous exhibition, letters to David about his father's work, and printed material.