utilities.iowadot.gov - /NHSX-030-6(231)--3H-06/CADD030(231)/Machine_Control_Surfaces/Ramps/US 218 Ramp C/TINs/

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 2/21/2018 10:15 AM      1636544 prop_surf_subgrade_SR218C.tin
 2/21/2018 10:15 AM      1640696 prop_surf_top_SR218C.tin