You can check for availability of books in Perusall by searching the Perusall catalog; the catalog can be searched by publisher, topic (BISAC code), title, author, or ISBN. (Note that the ISBN in Perusall is the ebook ISBN assigned by the publisher, so searching for a print book ISBN may yield no results even if the book exists in our catalog; in these cases, search by title or author.)
If you can't find a particular title, please contact support@perusall.com.