R.J.A. Talbert, Rome's World: The Peutinger Map Reconsidered (2010) is $34 on Amazon in paperback. It's not a hard book to find and it isn't in Latin or something. https://www.amazon.com/Romes-World-Peutinger-Map-Reconsidered-dp-1107685753/dp/1107685753/ref=mt_other?_encoding=UTF8&me=&qid= … I don't think it is the classicists who are silo'd in this case.
Talbert and Broderson, Space in the Roman World: Its Perception and Presentation (2004) is also not hard to get; currently $25 on amazon. https://www.amazon.com/Space-Roman-World-Perception-Presentation/dp/3825874192 … To be clear, my point here is that these are not resources beyond the capabilities of one's local library to get.