This is a great one. We finally dug up a few good maps of the surrounding area, outside the District line. This shows Bethesda and a chunk of Montgomery County (why is it named Montgomery County?). Click on it for a larger map.
Exploring Bethesda and Montgomery County: A Map of the Area from 1878
Explore the area around Bethesda and Montgomery County, MD with this 1878 map. Learn why it was named Montgomery County and more! Click for a larger map.