We constructed a data set starting from the observation that several English and literature courses make use of books that are sometimes also available in the form of abstracts -meant to ease the access of students to the content of the books.
we have identified two main publishers that make summaries available online for books studied in the U.S. high-school and college systems: Grade Saver (http://www.gradesaver.com) and Cliff's Notes (http://www.cliffsnotes.com/).