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              Dunlap, R. E., & Mertig, A. G. (1997). Global environmental concern: An anomaly for postmaterialism. Social Science Quarterly, 78, 24-29.
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              Dunlap, R.E. and Mertig, A.G., 1997. Global environmental concern: an anomaly for postmaterialism. Social Science Quarterly, 78 (1), 24-29.
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              Dunlap, R.E.; Mertig, A.G. Global Environmental Concern: An Anomaly for Postmaterialism. Soc. Sci. Q. 1997, 78, 24-29.
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