Long-term observation of the geological environment : needs and techniques = Observation a long terme du milieu géologique : besoins et techniques.
OECD Nuclear Energy Agency.
Paris : Organisation for Economic Co-operation and Development, Nuclear Energy Agency,
1993.
At head of title : Disposal of radioactive waste.
Proceedings of an NEA workshop, Helsinki, Finland, 9 - 11 September 1991.
Includes bibliographical references.