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@edent Yeah, the mobile UI is mostly nonexistent (but it’s workable to some extent). For Germany, we’ve freely accessible metadata about all books that one can buy here: portal.dnb.de/opac.htm?method=simpleSearch&cqlMode=true&query=idn%3D958131651. It includes RDF machine-readable data, too. No purchase option, tho (which was your point).