90895-01-postcard.tif "Thayers Tunnel and Sap, Union Ave., Vicksburg National Military Park." Read More "Thayers Tunnel and Sap, Union Ave., Vicksburg National Military Park." More Info Collection Description General & Tech Data Catalog Record ... cooper cooper 90895-01-postcard 1 « Previous of 4583 Next » Details Item: 3018 Description: "Thayers Tunnel and Sap, Union Ave., Vicksburg National Military Park." Date: 19xx City/State: Vicksburg, Mississippi County: Warren County Call Number: PI/1992.0001 Filename: 90895-01-postcard.tif