Wrong thumb at 600px
https://upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Delle_strade_ferrate_e_della_loro_futura_influenza_in_Europa.djvu/page206-600px-Delle_strade_ferrate_e_della_loro_futura_influenza_in_Europa.djvu.jpg
currently gives a 600x1029px thumb of paper page 194 of the book.
This is the old thumb before reuploading; https://commons.wikimedia.org/w/thumb.php?f=Delle_strade_ferrate_e_della_loro_futura_influenza_in_Europa.djvu&w=600&p=206 produces the right one (p. 192) at 600x1016px (which is the right ratio at the current resolution, while I don't know where the other ratio comes from).
Other sizes work, purging repeatedly didn't help.
The right thumb can be called on the wiki specifying the height, but this doesn't always help.
You can see examples on [[:s:it:Discussioni pagina:Delle strade ferrate e della loro futura influenza in Europa.djvu/206]] as well.
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