Scope and Contents The MSD Pollution Abatement Collection contains seven photographs documenting pollution abatement projects undertaken by the Metropolitan St. Louis Sewer District (MSD) from 1966-1969. Photographs are identified with the project, location, contract number, date, and firm undertaking the work. Photographs show crews at work in various tunnels, as well as above-ground excavating and sheet piling work. Locations include the Locust Street construction shaft, Horseshoe Tunnel at Highway...