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	title = {Descriptions of some new Operculated Land-shells from Southern India and Ceylon},
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	year = {1875},
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	chapter = {442},
	url = {http://www.biodiversitylibrary.org/item/90418$\#$page/576/mode/1up},
	author = {R.H. Beddome}
}
@article {67,
	title = {Catalogue des esp{\`e}ces appartenant au genre Opisthostoma, Blanford.},
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	year = {1879},
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	chapter = {193},
	url = {http://www.biodiversitylibrary.org/item/54087$\#$page/209/mode/1up},
	author = {H. Crosse}
}
@article {73,
	title = {Nouvelles contributions malacologiques},
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	chapter = {273},
	url = {http://www.biodiversitylibrary.org/item/54677$\#$page/303/mode/1up},
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}
@article {688,
	title = {Catalog der gegenw{\"a}rtig lebend bekannten Pneumonopomen},
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	volume = {30},
	year = {1898},
	chapter = {134},
	url = {http://biodiversitylibrary.org/item/89671$\#$page/336/mode/1up},
	author = {W. Kobelt and O. von Moellendorff}
}
@article {45,
	title = {The Malayan species of Opisthostoma (Gastropoda, Probranchia, Cyclophoridae), with a catalogue of all the species hitherto described},
	journal = {The Bulletin of the Raffles Museum},
	volume = {24},
	year = {1952},
	pages = {5-61},
	chapter = {5},
	url = {http://rmbr.nus.edu.sg/rbz/biblio/24/24brm005-062.pdf},
	author = {van Benthem-Jutting, W.S.S.}
}
