Series XII contains lecture notes taken by Harold Wechsler (Columbia College, A.B. 1964; GSAS, M.A.1969, Ph.D. 1974) when he was an undergraduate and graduate student in history. Classes were taken with such notable professors as James Shenton, Walter Metzger, Richard Morris, Robert K. Merton, Frank Tannenbaum, and Jacques Barzun. Multiple classes are often found in one notebook and sometimes class notes are continued in a subsequent notebook. If multiple class notes are found in a notebook, flags have been placed within the notebook to delineate where notes for a particular class begin.