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Gold as it occurs naturally rarely pure, usually alloyed with silver and sometimes containing appreciable amounts of copper, palladium, or bismuth gold occurring in more or less coarse grains or flakes and obtainable by washing the sand, gravel, etc.
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Food web structure and basal resource utilization along a tropical island stream continuum, puerto rico.March catherine m.Tropical stream food webs are thought to be based primarily on terrestrial resources leaf litter in small forested headwater streams and algal resources in larger, wider streams.In tropical island streams, the.
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