It is an inconvenient and painstaking process.
You have to visit each page and right-click on it, then choose "Save page as..."
Also note that doing so can be construed as a violation of copyright law. I am not a lawyer and don't want to get into the legal details. Suffice to say I don't think Jeremiah would mind if you saved a copy for personal use.
It might be polite to ask him though (and respect his wishes if he says no). Then legally you would be in the clear. In fact it would be worthwhile to migrate this material to another site, though it would require Jeremiah's permission.
I would ask him myself, but I can't stand the guy.
"Wget can follow links in HTML and XHTML pages and create local versions of remote web sites, fully recreating the directory structure of the original site. This is sometimes referred to as recursive downloading."