CTRE / Jul 30, 2018
Secondary Surface Type
Provided data and sources for pavement surface types on secondary roads, including: http://www.iowadot.gov/maps//secbook2012.pdf.
CTRE / Jul 30, 2018
Provided data and sources for pavement surface types on secondary roads, including: http://www.iowadot.gov/maps//secbook2012.pdf.