Metadata

Hi!

I recently started maintaining project gutenberg ebooks (html formats). I realize that metadata of the books is extremely limited.

Rarely i find proper authors, genres, or ISBN#

I not using Calibre.

I am hoping to get guidance on best way to complete the meta data. I am also open to consider epub format if that has better metadata quality and completeness.

(For full disclosure: the end objective of the project i am part of is 'for profit' from the reading device.)