----------------- HES POSTING ----------------- [Posted from EHA list. HB] Can anyone point me to secondary literature regarding the work of the Danish engineer C.L. Madsen (1827-99) who, in the mid-late 1870s, attempted to establish a mathematical law concerning the volume of international trade and the number of international telegrams. ------------ FOOTER TO HES POSTING ------------ For information, send the message "info HES" to [log in to unmask]