Different file types allow different capabilities. For example, you can download pdf files. However, the Scholar Annotation tool will not work with pdfs but will for html and some electronic books.
Full Text HTML: HTML allows you to copy and paste. Animal Farm.
Full Text PDF: Animal Farm.
Full Text PDF Spanish/English Version: Animal Farm.
Audio Book: George Orwell’s Animal Farm from Archive.org
Full Text with Audio Narration: Animal Farm.