UNIX_Reference_Card_by_L.L.Cherry.pdf
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Clem Cole wrote this in June 2024:
  Also, while looking for the vi cards, I turned up two wonderful artifacts
  that I'll try to get scanned and added to TUHS at some point. When you
  purchased V7 from AT&T, you got one copy of the printed docs and a small
  "purple/red" 9"x3.5" flip-binding reference card that Lorinda Cherry
  compiled. Also, when DEC released V7M-11, they printed a small flip-binding
  8"x4" reference called the "programmers guide" [AA-X7978-1C]—which is
  similar but different.

And Matt G. wrote this in Jan 2026:
  The references in the end date this to the Sixth Edition.  There is a
  blacked-out bit in the TROFF User's Manual reference, I can't quite make
  it out, it was in previous generations of whatever scan this came from
  but I can make out a 127 and a 4 I believe, it's probably a crossed out
  memorandum number.