The vignettes on the left side are taken from the letter column header used first in The Doom Patrol (DC, 1964 series) #109 (February 1967).
This was originally only 7.67 pages, but the bottom tier of Part 3's splash page was moved to the open bottom of the last page here and the big splash panel (the rest of that page) was deleted.
Editing: as indicated in Sequence 2, the "part" break was originally several pages earlier; the bottom tier of what was originally overall page 23 is deleted, replaced with top tier from p. 24, remaining two tiers there moved up, top tier from p, 25 moved under them, and a reduced version of the second (and last) tier of p. 25 occupies the upper quarter of a page shared with Sequence 4.
The page is shared with the last tier of the preceding story. This is not the feature ("your letters plus a bio of Murray Boltinoff") promised by Asherman in the previous issue. The article is signed "Allan Asherman, editor."