This essay was published in (perhaps among other places) in "Wampeters Foma and Granfalloons". There are two Wheaton Colleges in the U.S., one in Norton MA and the other in Wheaton IL. Does anyone know (and can you provide a reference) as to which of these two colleges this address was delivered at?
It appears to be the one in Massachusetts. The essay is frequently cited as being published in Wheaton College alumnae magazine, which is the magazine of the Wheaton College in Massachusetts.
I note, however, that the library's own history page does not make any mention of a rededication in 1973. There was a renaming of a room after a key alumna in 1972.