Perhaps you should try some spelling variations:
"Sediment identity factor composition method" » "Sediment identify factor composition method" (Expand Search), "Sediment identity factors composition method" (Expand Search), "Sediment identity factor composition methods" (Expand Search)
"Sediment density factor composition method" » "Sediment density factors composition method" (Expand Search), "Sediment density factor composition methods" (Expand Search)

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