328U: 60s-70s time-travel medieval fantasy, siblings, beautiful illustrations

I checked this book out multiple times from our public library. Author’s name must begin with Bu-Ea based on shelf location (preceded Eager; after Burnett), is not Ruth Chew after reviewing her catalog. Previous helpful respondents from other attempted search sites have suggested A Walk in Wolf Wood (Mary Stewart) or Walk out of the World (Ruth Nichols), which are lovely and similar, but incorrect (my lovely childhood public librarians were not illiterate enough to repeatedly mis-shelve this book, and my memory is solid about where it was located on the shelves).

This is a beautifully illustrated, middle-reader American (I think) fantasy book about a brother/sister or possibly male/female friends who somehow stumbled from their somewhat urban home/apartment building into a medieval setting when coming home from school one day in the woods near their home.

Sister ends up spending time with women from the group (I remember some looming?) and brother with the men (possibly becoming a page/squire?) There is maybe a joust, some magic or Merlin-y magician, the illustrations were very lovely with lots of woods/trees. Cover art and some interior pen+ink drawings reminded me of the cover to the film adaptation of Camelot.

I was born in 1970 and was a very early and voracious reader, so this book cannot have been published much later than 1976; my guess (contextually) is that it’s most-likely a little earlier than that.

Many thanks!!

328T: Kids Travel to Prehistoric Age

I am looking for a book I read in junior high back in the early 80’s. I am guessing it was from the 1950s or 60s because the book was older looking with that canvas style cover and it was green. It was about 4ish siblings (some could have been friends) that went back in time or into another dimension to the prehistoric age. I think they went through some sort of shrubbery door, but not sure. I remember them, of course, trying to get back home, because there were dinosaurs and they didn’t have much food. They came across some sort of plant at some point that sustained them. I thought the title was something about being “Lost in Time”, “Forgotten World/Past”, etc. but just a guess. Thank you kindly for any help. I have Google searched and came across a couple of books about adults getting lost in prehistoric times but this was for sure about kids and I think they were siblings and maybe even a friend with them. Maybe the oldest being early teens down to a 7 year old. Again, thanks and I hope you can help!

327B: Time Traveling Girl

No idea of publication year, I read it in 2003.  Title is something like “As Time Passes” or “Time Lost” but I honestly only know that it has something to do with time in the title.  No idea on character names, one might be Isabella ??  Plot description: has something to do with a girl traveling back in time to different eras, she meets a guy at one point who she falls in love with, but then travels to another time where she is maybe held captive in a royal castle where they think she is their daughter or something to that extent. I honestly don’t remember how she time travels, maybe because of a book she finds, or some kind of power??  I believe the front cover is like a pale yellow with a girl facing away with a braid in her hair.