I am writing the preface to a small book (4" x 6") where I have already used the term "small book". The opportunity to use the term again arose shortly thereafter and to avoid redundancy, I would like to inquire if anyone knows of a good synonym for "small book" that perhaps does not utilize the word book?

I am writing the preface to a small book (4" x 6" with 200+ pages) where I have already used the term "small book". The opportunity to use the term again arose shortly thereafter and to avoid redundancy, I would like to inquire if anyone knows of a good synonym for "small book" that perhaps does not utilize the word book?