Geological survey of Great Britain (England and Wales) 1:50 000 series : solid and
drift edition. Sheet 188, Cambridge / Geological survey of Great Britain (England
and Wales) ; made and published by the Director General of the Ordnance Survey, Southampton,
for the Institute of Geological Sciences, Natural environment research council ; Surveyed
on the six-inch scale by S.C.A. Holmes, J.H. Taylor, J.R. Earp [et al.] ; C.H. Dinham,
T.H. Whitehead and F.H. Edmunds, Districts Geologists, 1981