National Science Teachers Association & ebrary, Inc. (2001). Dig in!: Hands-on soil investigations. NSTA Press.
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Chicago-čujuhus (17. p.)
National Science Teachers Association juo Inc ebrary. Dig in!: Hands-on Soil Investigations. Arlington, Va.: NSTA Press, 2001.
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MLA-čujuhus (9. p.)
National Science Teachers Association juo Inc ebrary. Dig in!: Hands-on Soil Investigations. NSTA Press, 2001.
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