Buy links auto-switch to the visitor's local Amazon by country (UK, France, Spain, Portugal, USA + Latin America), appending that region's tag. Portugal has no Amazon marketplace of its own, so Portuguese shoppers go to amazon.es; USA and Latin American visitors go to amazon.com. Everyone else gets the default storefront above. Each book's link should point at an amazon.* URL — search links localise cleanly; direct product (/dp/) links may not exist in every marketplace.

Excel round-trip: download, edit in Excel, upload — the list here updates, then hit Save & publish. Uploading replaces the whole ledger (order = row order). Tropes are separated with “|”. Margin notes are kept for rows whose id is unchanged.