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Frisian language -- To 1500 -- History. / https://id.loc.gov/authorities/subjects/sh85052009 https://id.loc.gov/authorities/subjects/sh99005024 : Bremmer, Rolf H.
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Frisian language -- To 1500 -- Texts. / https://id.loc.gov/authorities/subjects/sh85052009 https://id.loc.gov/authorities/subjects/sh99001271 : Bremmer, Rolf H.