Correspondence pertaining to von Engeln's years at Cornell as a student and professor and to his writings on geology and Cornell history; student notebooks and exams; manuscripts of published and unpublished works; ice experiment notes by John L. Rich, 1911, later published by von Engeln, 1914; ice surface rubbings; "Records of Physiographical Experiments," 1915-1917; photographs and lantern slides of family, friends, colleagues and students, geological subjects, and world travels, including oversized glass plates and negatives of New York State Relief Maps; von Engeln's camera; photographs of natural features in Turkestan taken by W. Rickmer Rickmers, with related correspondence; clippings; scrapbooks, diaries; certificates and diplomas; and a family genealogy. Material pertaining to Ralph S. Tarr, Professor of Geology, and reminiscences of other Geology Department members. Also, letters (including one from T. C. Chamberlin), unpublished articles, notes, two diaries, and photograph album (with identification) concerning Alaskan trips in 1906 and 1907.