Thanks for the answers! Found it:

> All Project Gutenberg metadata are available digitally in the XML/RDF format. This is updated daily (other than the legacy format mentioned below). Please use one of these files as input to a database or other tools you may be developing, instead of crawling or roboting the website.

And strongly consider a donation! (My addition)

https://www.gutenberg.org/ebooks/offline_catalogs.html#the-p...