This is a book of letters. Lots of letters. It would be a fun way to teach children how to write what my fifth grade teacher called bread and butter and friendly letters.
Anyway, if you are teaching that concept, I recommend this book. It has letters between Peter Rabbit, Goldilocks and Baby Bear (or the Three Bears) and also between two wolf cousins. So it is fun for the children, with several models for writing letters using the appropriate headings, addressing, and closings.
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Not a paid review, just a book we ran across at the library!