The Floyd River valley serves as the central corridor for this 2015 study, carving through the transition from rural Plymouth County into the northern reaches of Sioux City. The landscape is defined by a grid of agricultural section lines and township boundaries, including t90n r46w and t89n r47w, which delineate the fertile plains between the Floyd and Perry Cr.
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1955 · Sioux City
USGS Topo · 1:250,000
1958 · Sioux City
USGS Topo · 1:250,000
1959 · Sioux City
USGS Topo · 1:250,000
1962 · Union Center
USGS Topo · 1:62,500
1963 · Sioux City South
USGS Topo · 1:24,000
1963 · Sioux City North
USGS Topo · 1:24,000
1964 · Sergeant Bluff
USGS Topo · 1:24,000
1964 · James
USGS Topo · 1:24,000
1964 · Hinton
USGS Topo · 1:24,000
1964 · Lawton
USGS Topo · 1:24,000