Hello, I just joined this list but I'm interested in this current thread. What is the goal of moving to these static HTML pages / directories? Is it to eliminate the processing time necessary to generate these files with the current back-end processing? Seems you will be (possibly) using more disk space - a trade-off which may be worth it, I'm not arguing against it - to save CPU time? I need to understand more - What is currently stored for each book? Is it stored in all of the formats at http://aleph.gutenberg.org/cache/epub/56843/ or are those created at the time someone requests them? In https://www.gutenberg.org/files/56843/ what's the difference between the -0 zip and the -h zip? Tim Hare Tallahassee, FL Interested Bystander, Non-Inc.