His homepage has a few more, http://www.billmudron.com/, if you go to "For Me" and click on the bottom right for the gallery.
Trademark may be a clearer case: he's clearly reusing trademarked terms in a context that could cause someone to believe they are from the trademark owners.
Anyway, I hope he's allowed to continue making and selling them. They're amazing, and should exist.
These books were a must read when I was an architecture student. And if you are really into this topic you can also read "The poetics of space" from Gaston Bachelard.
"Foucalt's pendulum" was great, "the island of the day before" meh, "Baudolino" was great, "queen loana's flame" was disappointing (I haven't read "Prague's cemetery" yet).
But: this isn't a novel, so different rules apply. Also, amazon has 12 reviews for it all with 5 stars :)
http://www.turismofvg.it/ProxyVFS.axd/popup/r11207/file-jpg?...
There is however this other genre of curiosity maps:
http://libweb5.princeton.edu/visual_materials/maps/websites/...
http://libweb5.princeton.edu/visual_materials/maps/websites/...