Reddit reviews Allen Peck's WWI Letters Home-1917-1919: U.S. Army WW I Pilot Assigned to France
We found 1 Reddit comments about Allen Peck's WWI Letters Home-1917-1919: U.S. Army WW I Pilot Assigned to France. Here are the top ones, ranked by their Reddit score.
http://www.the-best-childrens-books.org/Archies-War.html
This one could be a book you might have read in school. It's designed for kids and is written like a children's scrapbook full of letters from soldiers and notes about the war.
Here are a couple others that could also fit with what you remember...
https://www.amazon.com/Love-Letters-Great-Mandy-Kirkby/dp/0230772838
https://www.amazon.com/Allen-Peck%C2%92s-Letters-Home-1917-1919/dp/0595362230
Best of luck finding this! It sounds like an interesting book!