The only known photograph of five Harvard presidents together
(HUP-SF Presidents 1861: 15a)

Quinquennial Catalogue
(Papers of Leonard Hoar, UAI 15.852)

Queries Worthy of Consideration, 1700
(Papers of Increase Mather, UAI 15.860)

A working model of Hill's perpetual calendar, [1885?]
(Papers of Thomas Hill, UAI 15.892)