
The Salt River carves a deep valley through the Ralls County landscape, its meandering course defined by a complex network of ridges and deep drainage ravines like Griffin Hollow and Johnson Hollow. This 1990s revision, based on imagery updated by the U.S. Corps of Engineers, shows the community of Center at the southern edge, while the older riverside settlements of Spalding and Cincinnati sit at lower elevations near the water's edge.
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This is the sole edition of this map. No revisions or reprints were ever made.
1890 · Louisiana
USGS Topo · 1:125,000
1890 · Mexico
USGS Topo · 1:125,000
1903 · Palmyra
USGS Topo · 1:125,000
1932 · Hannibal
USGS Topo · 1:62,500
1936 · Hannibal
USGS Topo · 1:48,000
1943 · Vandalia
USGS Topo · 1:62,500
1945 · Hannibal
USGS Topo · 1:62,500
1945 · Perry
USGS Topo · 1:62,500
1945 · Vandalia
USGS Topo · 1:62,500
1948 · Quincy
USGS Topo · 1:250,000