Bates, Robert2010-03-021972Bates, Robert H. 1972. Trade union membership in the coppermines of Zambia: a test of some hypotheses. Economic Development and Cultural Change 20, no. 2: 280-298.0013-0079http://nrs.harvard.edu/urn-3:HUL.InstRepos:3710398en-US2010-03-0210.1086/450548