BellTopo Sans is is a free typeface based on maps from 1800s

While working on maps inspired by USGS maps from the 1800s, Sarah Bell made a typeface to match:

While making my own USGS-inspired maps, my search never returned the exact type of font I was looking for. The fruitless search was serendipitous however, because it provided the push to make my own. It was designed for map labels that are no larger than 80-100pt, but usually much smaller. I decided to name it BellTopo Sans with the plan to create a serif version.

She made it available here.