More on the mysterious concrete markers in Virginia - The Washington Post
Boundary Stones: The quest to save DC's 1st federal monuments - WTOP News
Property Line Markers in NYC Sidewalks Offer Crossing Only By Permission - Untapped New York
Granite Boundary Markers – Stone of New England
What does the "R/W" on this marker in the ground signify? I see ones just like it spread out and in close proximity to the telephone company's buried fiber ring all over
Living in Dryden: Mysterious markers
File:United States National Geodetic Survey marker 5667.JPG - Wikimedia Commons
bronze-alamo-property-line-marker_sarah-reveley. - San Antonio Report
This concrete object was in my front yard when I bought my house. Anyone know what it may be? : r/whatisthisthing
Precast Concrete Monuments - CM6x6x36
Geodetic Marker on cement pillar | Land surveying, Surveying equipment, Surveying
Boundary Stones: The quest to save DC's 1st federal monuments - WTOP News
Boundary Monuments: Artificial and Natural Markers
3 Ways to Determine Property Lines - wikiHow
30" Surveyors Concrete Monument
South Boundary Stone of Washington, DC – Alexandria, Virginia - Atlas Obscura
