Obscure Venn diagram references

• Obituary of John Venn, Proceedings of the Royal Society London, A 110 (1926) x-xi.
• John Venn zum 150. Geburtstag. (German), [On the 150th anniversary of John Venn's birthday], Praxis Math. 26 (1984) 343-345. (MR CMP 771 260)
• Illustrating Formal Logic with Johnston Diagrams, logictutorial.com (2001). [Johnston diagrams are a simple extension of Venn diagrams adding shading]
• L'epistemologia di Cambridge 1850-1950 (Italian). [Epistemology at Cambridge 1850-1950.] Temi e Discussioni, Societa Editrice Il Mulina, Bologna, 1987. (MR 90g:01026)
• A. Archer, A Venn diagram analogue computer, Nature 166 (1950) 829. (MR 12,362g)
• Terry Boswell, A note on John Venn as a collector and bibliographer of works on logic, Hist. Philos. Logic, 16 (1995) 121-125. (MR 98d:01022)
• A. W. F. Edwards, Commemorative Windows in the Hall of Gonville and Caius College, Cambridge, England, The Mathematical Tourist, Vol. 24 No. 2 (2002) 43-44. [Contains information on the John Venn commemorative stained-glass window]
• Robert Froman, A Young Math Book: Venn Diagrams, Fitzhenry and Whiteside, 1972. [A book for young children about the uses of Venn diagrams. At most 3 sets are used.]
• Ted W. Yellman, Better than Venn? -- The Ben Diagram, IEEE Trans. Reliability, 38 (1989) 341-342. [The "Ben" is for Ben Franklin]