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}
@book {533,
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@book {549,
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	year = {1976},
	pages = {484},
	publisher = {Bohn, Scheltema \& Holkeme Utrecht},
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	isbn = {9031301760},
	author = {S. Van Der Spoel}
}
@article {537,
	title = {The pteropod Desmopterus pacificus sp. nov. Linnaeus, 1767},
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	volume = {19},
	year = {1919},
	pages = {88},
	chapter = {85},
	author = {C. Essenberg}
}
@article {548,
	title = {Distribution of pteropods (Gastropoda: Tehcosomata and Pseudothecosomata) in the Gulf of Mexico and adjacent areas},
	journal = {Journal of Tropical Biology},
	volume = {42},
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	chapter = {1},
	author = {E. Suarez-Morales}
}
