How do I get an extra large cover image from the Google Book API?

According to google doc, using this link you can get a url big for a book

Google Doc

However, when I clicked https://www.googleapis.com/books/v1/volumes/zyTCAlFPjgYC , there are only 2 thumbnails (small and medium). So do I need to get a Google API key to get full book information?

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I realized that you can replace &zoom=1 part of the URL with &zoom=0 for large images, but only in some cases.

For example, this is a small sketch of Sherlock Holmes:

http://bks5.books.google.com/books?id=buc0AAAAMAAJ&printsec=frontcover&img=1&zoom=1&edge=curl&source=gbs_api

Now, setting zoom to 0 , I get a big sketch:

http://bks5.books.google.com/books?id=buc0AAAAMAAJ&printsec=frontcover&img=1&zoom=0&edge=curl&source=gbs_api

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In fact, with some books, google provides a large image, but some do not.

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Source: https://habr.com/ru/post/916462/


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