Aerial survey project no. 91S-36 was flown on April 21, 1991. These photos are a verbal scale of 1"=400'. The flight lines provide coverage for highway 4 from the junction with highway I-90 to the Iowa State line.
Aerial survey project no. 91S-36 was flown on April 21, 1991. These photos are a verbal scale of 1"=400'. The flight lines provide coverage for highway 4 from the junction with highway I-90 to the Iowa State line.
