The Soils Types and 1935 Aerails have been added to KGIS Maps.
To change to the Soil Types map, click here or click on Maps tab in upper left of KGIS Maps, then expand Other maps, and then click on the Soil Types.
To change to the 1935 Aerials map, click here or click on Maps tab in upper left of KGIS Maps, then expand Historical Aerials, and then click on the 1935 Aerials.

UPDATE: Link to Knox County Soil Survey Building Site Development document at Knox Planning