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Ludvigsen, R.; Perry, D. G. (1975). The brachiopod Warrenella in the Lower and Middle Devonian formations of northwestern Canada. Canada Geological Survey Bulletin. 235: 59-107.
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Ludvigsen, R.; Perry, D. G.
1975
The brachiopod <i>Warrenella</i> in the Lower and Middle Devonian formations of northwestern Canada
Canada Geological Survey Bulletin
235: 59-107
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