Innovation diffusion as a spatial process / by Torsten Hagerstrand ; Postscript and translation by Allan Pred. Translated with the assistance of Greta Haag. Innovationsförloppet ur korologisk synpunkt. English Hägerstrand, Torsten. Diffusion of innovations Sweden. HN573 .H313 910 HAI Translation of Innovationsförloppet ur korologisk synpunkt. Includes bibliographical references. Chicago : University of Chicago Press , c1967 c1967 1967 Text xvi, 334 p. : eng engund Sweden Social conditions. Sweden.