More resources
“Harvard Degree Diplomas” (Find It @ Harvard) by Samuel Eliot Morison. Harvard Alumni Bulletin Volume 35 (1933): 804-813.
"Harvard Firsts and Honorary Degrees" (Find It @ Harvard) by Samuel Eliot Morison. Harvard Alumni Bulletin (June 15, 1934): 1011-1012.
Harvard University Honorary Degrees webpage
"Honorary Degrees at Harvard" by Kimball C. Elkins. Harvard Library Bulletin Volume XII Number 3 (Autumn 1958): 326-353.
"Official Terms in Latin and English for Harvard College or University" by Mason Hammond. Harvard Library Bulletin Volume XXXV Number 3 (Summer 1987): 294-310.
"The Spirit and Spectacle of Harvard Commencement" by Marvin Hightower.