Underwater

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"Ringing the Wild Horse" Site (Oklahoma County, Oklahoma)
Blennerhassett Island Historic District (Wood County, West Virginia)
Cabrillo National Monument (San Diego County, California)
Chamizal National Memorial (El Paso County, Texas)
Coronado National Memorial (Cochise County, Arizona)
Egmont Key (Hillsborough County, Florida)
Fages-De Anza Trail-Southern Emigrant Road (Unspecified county, California)
Goddard Rocket Launching Site (Worcester County, Massachusetts)
Leeper Farm (Hamblen County, Tennessee)
Mountain Meadows Historic Site (Washington County, Utah)
Piscataway Park (Prince George's County, Maryland)
Robidoux Inscription (Grand County, Utah)
Rock Mary (Caddo County, Oklahoma)
Seven Ranges Terminus (Stark County, Ohio)
Site No. HD 5-26 (Pima County, Arizona)
Site No. HD 7-0A (Pima County, Arizona)
Site No. HD 9-28 (Pima County, Arizona)
Site Nos. HD 5-28/5-25 (Pima County, Arizona)
Site Nos. HD 9-11/9-2 (Pima County, Arizona)
Weippe Prairie (Clearwater County, Idaho)
Willa Cather Memorial Prairie (Webster County, Nebraska)