1. 1Appreciation is expressed to the Canada Council for a grant in support of the research reported on.
2. 3. Torsten Hagerstrand, and Antoni R. Kuklinski , Information Systems for Regional Development - A Seminar, Lund Studies in Geography, Ser.b, No. 37 (1971), p.v .
3. See alsoGunnar Tornqvist , Contact Systems and Regional Development, Lund Studies in Geography, Ser. b, No. 35 (1970 );