This sounds like a useful set of resources for people running games between the 1850s and 1930s, I'm sure you can find copies online:

"They are travel guides, produced primarily from the 1850s through the 1930s and then trickling off through the 70s. There are tons of them covering Europe, but the occasional volume tackles other northern hemisphere locales like India, Russia, Canada and the US." only had one sadly, but it is the one to London, which seems like a useful adventure location:

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