Innumerable friends, experts, companies and research centres have helped in the making of this book.

Systems planner Erkki Kurenniemi, CEO Veikko Kuusakoski, assistant professor Peter Lund, research director Olli Martikainen, director Yrjö Neuvo, Matti Ojanperä, MSc(Eng), professor Rainer Salomaa, production group director Franciska Sundholm, zoo director Seppo Turunen and professor Pertti Törmälä have all read parts of the manuscript and made their invaluable comments.

Architects Markku Hedman and Jari Tirkkonen have drawn the maps and technical illustrations, and Olavi Holmijoki, MSc(Eng), has checked the calculations concerning land use. The artist Paul Osipow designed the colours for the illustrations and Terhi Hakala drew the diagrams.

Numerous Finnish and foreign companies, public offices and schools have given their assistance in acquiring photographic and other material. Among them I would particularly like to thank Nokia Oy, Ahlström A Oy and Kuusakoski Oy.

My wife Leena, son Pekka and good friend Pepe Salonen have all read parts of the manuscript and offered many useful remarks.

To all of you my most sincere thanks. Your work has been invaluable. I, naturally, am responsible for the contents.

Tuusula, Spring 1996

Eero Paloheimo