United Nations. (1997). On solid ground: Science, technology, and integrated land management. IDRC.
Tohutoru Kātū Chicago (17th ed.)United Nations. On Solid Ground: Science, Technology, and Integrated Land Management. Ottawa: IDRC, 1997.
Tohutoro MLA (9th ed.)United Nations. On Solid Ground: Science, Technology, and Integrated Land Management. IDRC, 1997.
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