Notes for Whitehead's seminar. They are typed and pasted into a pre-numbered notebook. It seems likely that the notes are not Weiss's, and that he instead got them from another student. See LET636 and LET637.
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Weiss, Paul, "Whitehead Lecture Notes: Seminary in Logic," STU064, Whitehead Research Library, accessed March 5, 2021, http://wrl.whiteheadresearch.org/items/show/591.