Plans for future changes at Grassmoor Colliery, Plans 1-4 and 6. Plan 1 comparing existing and proposed future layout of No 1 bank staff double shift winding, including numbered index schedule. Plan 2 comparing existing and proposed future layout of No 4 Pit bank staff double shift winding, including numbered index schedule. Plan 3 comparing existing layout of No 1 Pit Bottom manpower and top deck with future layout, including annotated notes and numbered index schedule. Plan 4 comparing existing and future layout of No 4 Pit Bottom manpower, including numbered index schedule. Plan 6 for First Piper seam, including annotated dates parts of seam were worked, scale 1:5000. 1947-1948