Plans and sections of sewerage in the Borough of Derby The original numbers are still visible on the documents (followed by an "s", presumably short for "sewerage") and have been retained in this list, following the series reference D7058/1. There are five exceptions: map 50s, which would have become D7058/1/50, was not included in the collection at the time of transfer to Derbyshire Record Office; maps D7058/1/64-65 were not numbered; D7058/1/63 and 66 were originally numbered 128s and 129s. All but a few of the sections and plans have been signed by the Borough's Resident Engineer, James McKie, and dated July 1909. 1909