Twentymile, Florida

The same ground, surveyed 70 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1918 1988

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

• 1918 USGS Palm Valley quadrangle1:62500, 4 printings
• 1948 USGS Jacksonville quadrangle1:250000
• 1952 USGS Palm Valley quadrangle1:24000, 2 printings
• 1957 USGS Jacksonville quadrangle1:250000, 3 printings
• 1959 USGS Jacksonville quadrangle1:250000
• 1960 USGS Jacksonville quadrangle1:250000
• 1964 USGS Palm Valley quadrangle1:24000, 5 printings
• 1977 USGS Jacksonville quadrangle1:100000
• 1980 USGS Jacksonville quadrangle1:100000
• 1988 USGS Jacksonville quadrangle1:250000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 202 fires within 5 miles of Twentymile between 1992 and 2020, burning about 1,417 acres in total. 126 started naturally. 14 were recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

Settlements close enough to share some of these fires:

• Durbin
• Sampson
• Hilden
• Palm Valley
• Palm Valley Landing
• Ponte Vedra

Every fire recorded in St. Johns County

Regional context, not property-specific evidence. The federal mineral resources record lists 1 working within 5 miles of Twentymile: 1 prospect. None of them still produces. What was taken out: Phosphorus-Phosphates, Uranium, Iron, Magnesite, Aluminum, Fluorine-Fluorite. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Every working recorded in St. Johns County

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

Matched on this settlement's Geographic Names Information System number rather than its name, so it cannot be a different place of the same name in another state.

This settlement is recorded in the Geographic Names Information System as feature 308158. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.

Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.