UY is missing some items and could use a little cleanup.
#1. The pocketbook size TPBs begin with Book 1-7. In the Usagi Yojimbo HC / TP (Fantagraphics) series listing, Book 7 is missing the first edition which has a purple border consistent with Books 1-6.
https://www.betterworldbooks.com/product/detail/usagi-yojimbo-book-7-9781560973041
#2. Dark Horse produced Books 8-33 and 39-41. The Usagi Yojimbo HC / TP (Dark Horse) series listing only includes 8-33.
Book 39 collects UY: Ice and Snow. This isn’t in the individual series or HC / TP series but see #3 below.
Book 40 collects UY: The Crow. The individual series listing has the TP but it should be in the HC /TP series instead or in addition.
Book 41 collects UY: Ten Thousand Plums. This isn’t in the individual series or HC / TP series.
Note: Book 33 collects Usagi Yojimbo: The Hidden, another standalone series.
#3. IDW has collected TPs generally referenced as Book 34-38. The Usagi Yojimbo, vol. 4 TP series listing appears to have Books 34-39 but numbered 1-6. This series might be better named as Usagi Yojimbo HC / TP (IDW) and numbered 34-38. Also, as noted above in #2, Book 6/39 is a Dark Horse publication.
#4. The Usagi Yojimbo: Senso standalone series has a HC collected.
#5. The Usagi Yojimbo HC series listing has Book 13 and 25-33. This should be merged with the series in #2 above.
#6. The Usagi Yojimbo: Senso HC series listing might be better merged with the single-issues series.
#7. The Usagi Yojimbo saga (Planeta Comic) appears to be a non-English publication. There’s also a PC listing for Usagi Yojimbo: Fantagraphics Collection.
#7. The Usagi Yojimbo Book One series listing is redundant with #1 above.