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.