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.