Severn Trent Water, groundwater vulnerability / 
Soil Survey of England and Wales.Cartographic Department.
Severn-Trent Water Authority.
Harpenden :  Soil Survey of England and Wales, 
1987.
Entry sheets 1, 4, 6 published (1987) this series will presumably be supplanted by the National 1:100 000 series.
Information supplied for Severn Trent Water by BGS and Soil Survey (Soil Survey and Land Research Centre after sheet 1).
Three maps only published.