Thanks for the info!
https://www.mobileread.com/mobiguide looks like a great starting point. I converted it to epub with Calibre, unzipped it, converted the resulting html file to clean xml with htmltidy... The resulting file can be hacked with some xml-parsing scripts to extract the relevant information (and generate
OPDS Atom XML). That is, unless such data is readily available at Mobileread...
Enough challenge for some rainy afternoons ;-)