[Maps of the sand and gravel limestone, celsite and conglomerate resources of various parts of GreatBritain / 
Institute of Geological Sciences.Industrial Minerals Assessment Unit.
London :  I.G.S., 
1971.
Index map in Map Room.
With: I.G.S. mineral assessment reports. Reports prior to 1975 were published as part of the regular I.G.S. report series at GNL.6. (list with index map).