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Dyfyniad Arddull ChicagoMiller, Marc L., Richard P. Gale, and Perry J. Brown. Social Science in Natural Resource Management Systems. Boulder: Westview Press, 1987.
Dyfyniad MLAMiller, Marc L., et al. Social Science in Natural Resource Management Systems. Westview Press, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.