utilities.iowadot.gov - /NHSX-030-6(231)--3H-06/CADD030(231)/Machine_Control_Surfaces/Sideroads/23rd Avenue/DTMs/

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 2/21/2018 10:15 AM       158091 prop_surf_subgrade_SR23rdN.dtm
 2/21/2018 10:15 AM       216391 prop_surf_subgrade_SR23rdS.dtm
 2/21/2018 10:15 AM       400845 prop_surf_top_SR23rdN.dtm
 2/21/2018 10:15 AM       537934 prop_surf_top_SR23rdS.dtm