The blue Accopress binder has no date but a typed abstract page inside it which is dated 6 March 1987. Also inside the binder is a complete copy of Warfield's 1980 paper "Complementary Relations and Map Reading." Also lots of handwritten pages of notes, formulas, graphs, etc. I found this record in the GMU Electronic Finding Aid, and believe it must be what I described above when packing or writing this material into a note to send to GMU in the 2000 shipments. Box 76, Folder 21 "Complementary Relations & Map Reading, Complete Inference Systems" [John N. Warfield], 6 June 1987.
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