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Alisa J. Bieber, Mark W. Williams, Mark J. Johnsson, Thomas C. Davinroy, Nitrogen Transformations in Alpine Talus Fields, Green Lakes Valley, Front Range, Colorado, U.S.A., Arctic and Alpine Research, Vol. 30, No. 3 (Aug., 1998), pp. 266-271
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Bieber et al. (1998) studied this question.
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