1. Unique authors per decade

Distinct authors published in each decade, deduplicated by name.

2. Country distribution by decade

Each decade's source countries as percentage shares summing to 100%, so decades can be compared independently of publication volume.

Items by country of origin.

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4. Top ten source languages

The ten most frequent source languages across the whole corpus, as shares of all items with a recorded source language.

5. Language flow by decade

Each decade is linked to its five most frequent source languages, with band width proportional to the number of items.