Yes, at least for the example of "apple" it does restrict to just books if you choose "Books" from the pulldown next to the search field: https://www.amazon.com

Yes, at least for the example of "apple" it does restrict to just books if you choose "Books" from the pulldown next to the search field: https://www.amazon.com/s?k=apple&i=stripbooks https://www.amazon.com/s?k=apple&i=stripbooks