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

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 2/21/2018 10:15 AM       690378 prop_surf_subgrade_SR218D.dtm
 2/21/2018 10:15 AM      2284554 prop_surf_top_SR218D.dtm