Books that talk about soymilk?

[Pix]

That seems an unreasonable request to me. Perhaps (after searching the OPAC and asking for help, of course) you can enlist the aid of your local (and school) librarian to attest to the fact that books on soymilk are hard to come by (and even having 1 or 2 books on the topic isn't going to help an ENTIRE CLASS).

I used to volunteer at a library where the librarians had a pet peeves of teachers putting obligations on an entire class to look up info on a limited number of books and would happily write such a note.