ebrary, Inc, & Carlsen, W. S. (2004). Watershed dynamics (Teacher ed.). NSTA Press, National Science Teachers Association.
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Chicago-čujuhus (17. p.)
ebrary, Inc, juo William S. Carlsen. Watershed Dynamics. Teacher ed. Arlington, Va.: NSTA Press, National Science Teachers Association, 2004.
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MLA-čujuhus (9. p.)
ebrary, Inc, juo William S. Carlsen. Watershed Dynamics. Teacher ed. NSTA Press, National Science Teachers Association, 2004.
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