
The Sangamon River carves a winding path along the boundary between Mason and Cass counties, creating a complex floodplain of sloughs and lakes. The northern reach is defined by the slow-moving waters of Anderson Slough, McHenry Slough, and Fish Lake, while the southern terrain rises into more dissected hills. The small community of Newmansville anchors the southeastern corner, serving as a focal point for researchers interested in the local rural landscape.
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This is the sole edition of this map. No revisions or reprints were ever made.
1909 · Tallula
USGS Topo · 1:62,500
1930 · Chandlerville
USGS Topo · 1:62,500
1932 · Chandlerville
USGS Topo · 1:62,500
1932 · Virginia
USGS Topo · 1:62,500
1933 · Petersburg
USGS Topo · 1:62,500
1936 · Virginia
USGS Topo · 1:62,500
1938 · Petersburg
USGS Topo · 1:62,500
1940 · Tallula
USGS Topo · 1:62,500
1948 · Quincy
USGS Topo · 1:250,000
1956 · Quincy
USGS Topo · 1:250,000