"Purple Card" - Old school stuff

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Long time nixers
I've been up on Unix history, and I happened to find out about a so-called "Purple Card"

Quote:For [Unix] v6 and v7 Lorinda Cherry prepared a pocket reference, familiarly known as the ‘‘Purple Card, which is not shown. (source, p. 15)

But I couldn't find any scan or other independent mentions. Has anyone here heard about it, or knows where to find it?