United Nations: Department of Technical Co-operation & Development

title	ISBN-13 (ISBN-10)	year of publication
Ground Water in Western and Central Europe/Sales No E.90.Ii.A.25	978-92-1-104355-6 (92-1-104355-7)	1991
River and Lake Basin Development: Proceedings	978-92-1-104339-6 (92-1-104339-5)	1991