Resources
- NGS Database: Datasheets and Survey Mark Recovery
- USGS Datasheets
- Local Control Monument Databases
- NOAA Tides & Currents Bench Mark Data Sheets
- Waymarking search for “survey markers”
- GPS on BenchMarks (NGS)
- The National Bridge Inventory Database
- AbandonedRails.com
- Pennsylvania Highways
- PennDOT Historic Bridge Survey
- The Corner Corner
- U-SMART USACE (Army Corps of Engineers) Survey Monument Archival & Retrieval Tool
- BenchMap: NGS Control Marker Locator for Android
- Airway Maps on Internet Archive
- PID Prefix Map
- Historical Topo Map Explorer
- The Historical Topo Map Explorer provides a visual way to search and explore the USGS topographic map collection via geographic extent, publication year, and map scale. A transparency slider allows you to easily compare historical maps with each other or with the current basemap. The map layers can also be downloaded.
- Benchmark Hunting in Yellowstone National Park
- Finding RHONDA
- The Information Literacy of Survey Mark Hunting: A Dialogue
- Lasting Impressions: A Glimpse Into the Legacy of Surveying
- Geodetic Glossary from NGS
- Discovering The Cornerstones of Maine’s Mapping History
- Tri State Corners in the United States
- Results of Spirit Leveling in Arizona. 1899 to 1915, inclusive.
- Triangulation in Maine
- By Walter F. Reynolds. 1918.
- Spirit Leveling in Maine, 1899-1915
- By R. B. Marshall. 1916.
- Triangulation in Arizona
- 1927 datum. Part 1: First- and second-order triangulation in south central part of state, by Clement L. Garner. 1941.
- Flickr: USGS Geodetic Survey Markers
- Not all are actually USGS markers, or geodetic markers; many different agencies and types are represented.
- Recoveries Gallery (2019)
- Zhanna’s recoveries from 2019—there are a few nice images here, if I may say so myself.
- Airport Lighting Brochures
- These brochures from the 1920s and 1930s are provided by the Building Technology Heritage Library.
- Arrows Across America
- More about the beacon and arrow system that guided our pioneer aviators.
- Historical Map and Chart Collection, Office of Coast Survey
- Aeronautical charts, among other types of maps, are available at this site.
- Maintenance of Airway Beacon Facilities, 1962 manual
- Learn about the characteristics, operation and maintenance of airway beacon facilities, from the early acetylene-powered beacons to the familiar Crouse-Hinds DCB-36 beacons!
- Numidia Airport
- Numidia Airport is the home of a lovingly restored tower beacon and caretaker’s shanty. The airport’s owner has provided a detailed history of the airport and the U. S. Airmail system.
- Point of View, by Angela Minor
- Hiding in plain sight, massive arrows—about fifty to seventy feet long and made of concrete—lie across the country, slowly succumbing to the ravages of time. First published in Oklahoma Today Magazine.
- Strange Arrows Upon the Land, by Angela Minor
- They’re oftentimes visible only from the sky. They point in seemingly random directions. They’re about 70 feet long and made of deeply sun-bleached concrete. What are they? First published in Blue Ridge Country Magazine.