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U.S. Historic Survey Stones and Monuments
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This category is for non-disk monuments located in the United States whose position was established by surveying.
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Image for Tri-State Iron Post Historical Marker, USGS Valley Springs (SD,MN,IA)view gallery

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U.S. Historic Survey Stones and MonumentsTri-State Iron Post Historical Marker, USGS Valley Springs (SD,MN,IA)

in U.S. Historic Survey Stones and Monuments

Intersecting State borders of SD, MN, and IA with plaque on Monument entitled 'Tri-State Marker'

posted by: Groundspeak Premium Member plainsdrifter358

location: South Dakota

date approved: 1/16/2007

last visited: 9/28/2021

Image for SGT. FLOYD OBELISK view gallery

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U.S. Historic Survey Stones and MonumentsSGT. FLOYD OBELISK

in U.S. Historic Survey Stones and Monuments

Designation: SIOUX CITY FLOYD MON TIP SHAFT. Marker Type: Monument. Setting: setting not listed - see long description. Stability:

posted by: Groundspeak Regular Member GEO*Trailblazer 1

location: Iowa

date approved: 8/22/2006

last visited: 6/26/2019

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