Concord, Ohio

The same ground, surveyed 33 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1953 1986

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.

• 1953 USGS Muncie quadrangle1:250000, 5 printings
• 1956 USGS Muncie quadrangle1:250000
• 1961 USGS Greenville East quadrangle1:24000, 3 printings
• 1986 USGS Piqua quadrangle1:100000, 3 printings

Regional context, not property-specific evidence. Museums hold 479 specimens collected within 10 miles of Concord between 1838 and 1975: 458 Animalia, 14 Fungi, 7 Plantae. 12 distinct Species records are shown. Collected by A VERWYST, A. F. C.; Stover, W. G., Albrecht, C. and others. Each is a physical object with a catalogue number, and each entry opens the museum's record. This is what was collected and kept, not a survey of what lives here - nothing can be concluded from a species being absent.

Image	Species	Year	Collected by	Where, as recorded
	Calopteryx maculata (Palisot de Beauvois, 1807)	1942	[Not Stated]	Greenville Creek, 2-6 miles southeast of Union City
	Argia fumipennis violacea (Hagen, 1861)	1969	B. Montgomery, L. Alward & P. Alward	Baker's Motel, near Norwick
	Callitriche palustris L.	1838	Short, C.W.	Lexington, Kentucky.
	Dispira americana Thaxt.	1895	Rush W. H.	Greenville
	Etheostoma caeruleum Storer, 1845	1905	Clark, C. F. (Clarence F.)	Prairie Outlet, Sec 28 of Neave township, ~0.3 mi NE of Wayne Lakes Park, Neave township
	Etheostoma microperca Jordan & Gilbert, 1888	1905	Clark, C. F. (Clarence F.)	Prairie Outlet, Sec 28 of Neave township, ~0.3 mi NE of Wayne Lakes Park, Neave township
	Clitocybe multiceps Peck	1906	H.J. Brememan	Greenville
	Peziza vesiculosa Bull.	1907	Lucas, C	Greenville
	Amanita phalloides (Vaill. ex Fr.) Secr.	1909	A. F. C.; Stover, W. G.	Greenville
	Clitocybe odora (Bull.) P.Kumm.	1909	Stover, W. G.	Greenville
	Panaeolus solidipes (Peck) Sacc.	1909	Stover, W. G.	Greenville
	Fomes lobatus Cooke	1911	Overholts L. O.	Gettysburg

All 479 specimens within 10 miles, at the Global Biodiversity Information Facility.

Regional context, not property-specific evidence. The federal mineral resources record lists 4 workings within 5 miles of Concord: 2 past producers, 2 producers. 2 still produce. What was taken out: Clay, Sand and Gravel, Construction. 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 Darke County

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

This settlement is recorded in the Geographic Names Information System as feature 1048623. 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.

Specimens. Global Biodiversity Information Facility (GBIF), https://www.gbif.org/. Only records licensed CC0 or CC BY are used. Records licensed CC BY-NC are excluded because this site carries advertising. Images are checked individually and any whose licence is non-commercial, no-derivatives or unreadable is refused.

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.