There is no DRM (digital rights management) on Project Muse ebooks; however, ebooks can only be downloaded and printed chapter-by-chapter.
Currently the Project Muse ebook collection has almost 5000 titles with more being added all the time. You cannot limit to ebooks only from the home screen; choose Advanced Search to apply this limit.
The Advanced search screen allows you to apply limits of all different types, including the one for books.
The results screen displays book titles with the chapters that are deemed most relevant.
Although you cannot download a complete book, you have to download chapters, you can view the table of contents and the first several sentences of each chapter to help you determine if you are interested in a particular book chapter.