Sepanski, R.J.; Stoss, F. W.; Boden, T. A.; Kanciruk, P. & Farrell, M. P. Trends '90: A Compendium of Data on Global Change, report, August 1, 1990; (https://digital.library.unt.edu/ark:/67531/metadc1207824/m1/410/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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