978 resultados para Field gradient


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no.4(1922)

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v. 42 (1971)

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v. 41 (1970)

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v. 44 (1973)

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v.2:no.1(1900)

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Observations reported in the present paper have shown that Biomphalaria glabrata is being gradually displaced by B. straminea in coastal areas of two counties on the state of Pernambuco, Brazil, confirming former observations made in the same region.