Obscure Venn diagram references

Obituary of John Venn, Proceedings of the Royal Society London,
A 110 (1926) xxi.
 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) 341342.
[The "Ben" is for Ben Franklin]