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	isbn = {91-546-0241-6},
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	author = {Per M. J{\o}rgensen}
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	title = {The lichen family Pannariaceae in Europe},
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	volume = {45},
	year = {1978},
	pages = {49},
	author = {Per M. J{\o}rgensen}
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@article {1349,
	title = {The lichen family Pannariaceae in Europe},
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	volume = {45},
	year = {1978},
	pages = {70},
	author = {Per M. J{\o}rgensen}
}
@article {1532,
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	author = {Per M. J{\o}rgensen}
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@book {1290,
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	title = {Lichens},
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	year = {2000},
	pages = {288},
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@article {677,
	title = {Survey of the Lichen Family Pannariaceae on the American Continent, North of Mexico},
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	author = {Per M. J{\o}rgensen}
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	title = {Survey of the Lichen Family Pannariaceae on the American Continent, North of Mexico},
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	volume = {103},
	number = {4},
	year = {2000},
	pages = {670-704},
	author = {Per M. J{\o}rgensen}
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@book {1154,
	title = {The Macrolichens of New England},
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