the purpose of this transport and road research laboratory symposium, which was held at crowthorne on 14 february 1973, was to discuss the use of sources of information on geology and ground conditions that are available before the borehole investigation for a road is carried out. each session was introduced by brief reviews of particular aspects of the subject by invited speakers, and these were followed by a free exchange of views among the invited audience of consultants, contractors and doe engineers. these discussions formed an essential part of the proceedings, and are reported along with summaries of the papers by the invited speakers. (a)

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