About Survey Mark Hunting – Zhanna's SurveyStation
Can still find old 1930s era Geodetic Survey markers, if you know where to look... : r/njhiking
File:United States National Geodetic Survey marker (Rocky Butte).jpg - Wikimedia Commons
National Geodetic Survey Markers - Mountain Monkey Company
Geodetic survey marker hi-res stock photography and images - Alamy
Geodetic Survey Markers? What is the verdict on these little guys? We have a few of these located in our National Historic District. : r/NianticWayfarer