ISBN on the series overview page
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So I greatly prefer my books in paper form and if available will buy a physical edition 100% of the time over a digital one. However, when I click the "Buy digital" button it gives me a bunch of links to US retailers. Not living in the US, that is only mildly useful.
I think it would be greatly useful if the series overview page that lists all volumes and links on how to buy them would include the volume's ISBN, which would make it very easy to just order it from my local book store.
For example something like this:
