Hmm, Cynthia Gastelle went missing from Silver Spring on April 3rd, 1980. Easter was on April 6th in 1980. Silver Spring is a ~5 mile drive straight down Georgia Ave from Wheaton Plaza. Also, Rte 410 runs thru Silver Spring, and eventually runs into Prince Georges County and into the Northern section of Hyattsville.
Something else to add to this is that Cynthia Gastelle was found in a wooded area of Haymarket Va, which is right off of route 66 and only a few miles from Manassas Va. Manassas is where MDietz reported seeing the Lyons sisters and Rte66 is the most probable route to take from the Washington DC area to Southern Va areas like Thaxton.
Something else to add to this is that Cynthia Gastelle was found in a wooded area of Haymarket Va, which is right off of route 66 and only a few miles from Manassas Va. Manassas is where MDietz reported seeing the Lyons sisters and Rte66 is the most probable route to take from the Washington DC area to Southern Va areas like Thaxton.