At head of title: Institute of Geological Sciences.
Map on folded sheet in pocket.
The sand and gravel resources of the country between Hatfield Heath and Great Waltham, Essex : description of 1:25000 sheets TL51/61 by R. J. Marks. ISBN 0118841130. Published by H.M.S.O. in 1980. Publication and catalogue information, links to buy online and reader comments.