Above the main text section, in the menu, click on more and choose a publisher

Edit: assuming you are on mobile. Otherwise just pick a publisher from the menu

It is a terribly designed website. The intro post points to the (top-)left menu, but that doesn't contain any links to pages. The maps are accessible indexed by publisher in the menu below the site title, which is in light gray over a light background and overflows into a "More…" option at the end.

Not sure I can agree, I think the archive you posted is quite well laid out and from a cursory browse I found it easy to navigate. The site in the OP is far worse.

Unfortunate in the 'allegation of theft of style' sense, or something more serious? edit: 'hamburger' menu also not found on my side--index at bottom of post seen, but no maps found.