The Theory of Value - Essay by Wieser in the Annals of the American Academy of Political and Social Science. - http://socserv2.socsci.mcmaster.ca/~econ/ugcm/3ll3/wieser/value.txt
Natural Value - Friedrich von Wieser's magnum opus. - http://socserv2.socsci.mcmaster.ca/~econ/ugcm/3ll3/wieser/natural/index.html