I'm trying to improve my Known Lands map of Urbis, and I want to do this in the style of 19th century overland maps. And I could use some inspiration for this.

Thus, I'm looking for impressive large-scale 19th century maps with style elements I could steal. Particular ways of drawing mountains and other terrain features, political divisions, vegetation, terrain, and so forth - I want to look at a large number of variations so that I can decide on the best ones. So if you know of any such maps - which ones did you find the most useful for inspiration?