The western outskirts of El Dorado and the surrounding Union County countryside are defined by the intersection of industrial energy production and long-standing community landmarks. The South El Dorado Oil Field and the Nick Springs Oil Field signify the region's historical and economic ties to the petroleum industry. These fields sit alongside established settlements like Parkers Chapel and Pickering, where numerous family and community burial grounds, such as Old Parkers Chapel Cem and Shady Grove Cem, offer rich data for genealogical research.
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1927 · El Dorado
USGS Topo · 1:62,500
1930 · El Dorado
USGS Topo · 1:62,500
1951 · El Dorado
USGS Topo · 1:62,500
1953 · El Dorado
USGS Topo · 1:250,000
1957 · El Dorado
USGS Topo · 1:250,000
1958 · El Dorado
USGS Topo · 1:250,000
1960 · El Dorado
USGS Topo · 1:250,000
1962 · Lisbon
USGS Topo · 1:24,000
1962 · Smackover
USGS Topo · 1:24,000
1962 · Calion
USGS Topo · 1:24,000