For example: http://pbreadinglist.herokuapp.com/books/k1gzDwAAQBAJ
Image link: http://books.google.com/books?id=k1gzDwAAQBAJ&printsec=frontcover&img=1&zoom=2&source=gbs_gdata
I played a bit with it but did not find a consistent / reliable way to always get a big image for a book using Google Books API (= what we use for this project), nor other book APIs.
For example: http://pbreadinglist.herokuapp.com/books/k1gzDwAAQBAJ
Image link: http://books.google.com/books?id=k1gzDwAAQBAJ&printsec=frontcover&img=1&zoom=2&source=gbs_gdata
I played a bit with it but did not find a consistent / reliable way to always get a big image for a book using Google Books API (= what we use for this project), nor other book APIs.