
Sparta stands as a focal point in this 1977 orthophotoquad, which provides a photographic perspective of the Knox County landscape. Produced in cooperation with the Bureau of Indian Affairs, the imagery reveals a distinct pattern of agricultural land use and natural drainage. The winding course of Bazile Creek meanders through the eastern portion of the quadrangle, carving a riparian corridor through the surrounding fields and pastures. This specific format, utilizing rectified photoimagery rather than traditional topographic lines, allows for a clear visual analysis of the terrain and vegetation patterns as they existed in the late 1970s, highlighting the intersection of rural development and the local waterway.
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This is the sole edition of this map. No revisions or reprints were ever made.
1950 · Niobrara
USGS Topo · 1:24,000
1950 · Verdigre NE
USGS Topo · 1:24,000
1954 · Verdigre
USGS Topo · 1:24,000
1955 · Sioux City
USGS Topo · 1:250,000
1955 · O'Neill
USGS Topo · 1:250,000
1958 · Sioux City
USGS Topo · 1:250,000
1959 · O'Neill
USGS Topo · 1:250,000
1959 · Sioux City
USGS Topo · 1:250,000
1969 · O'Neill
USGS Topo · 1:250,000
1974 · Sparta
USGS Topo · 1:24,000