Hakutulokset - Papua New Guinea. Dept. of Environment & Conservation. Bureau of Water Resources
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1
Hydrometric yearbook 1988.
Julkaistu 1990“…Papua New Guinea. Dept. of Environment & Conservation. Bureau of Water Resources…”
Kirja
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2
Hydrometric yearbook 1987.
Julkaistu 1990“…Papua New Guinea. Dept. of Environment & Conservation. Bureau of Water Resources…”
Kirja