Favorite this☆ Workmen digging earth for sewer system Description: Groups of men dig earth and load it into horse-drawn wagons, behind them are large pipes that appear to be for sewer system, post office in background. Recorded in glass negative ledger: "LD/Buildings-Federal-Post office, 1897." Details Resource ID: EB02d030 Subject: Construction workers--Michigan--Detroit Horse-drawn vehicles--Michigan--Detroit Post office buildings--Michigan--Detroit Sewer-pipe Glass negatives Date Issued: 1897 Format: 1 negative : glass ; 4.75 x 3 in. Member of: Burton Historical Collection Negative Number: BHC glass neg. no. 172 Rights: Physical rights are retained by DPL. Copyright is retained in accordance with U.S. copyright laws.