According to the Kimberley Handbook, Nawurtu is the inland dialect of three Karajarri A64 dialects, the other two being Najanaja A106 on the coast and Nangu A105 in the middle. McGregor (2004:9) says that owners of the Nangu, Nawurtu and Najanaja language varieties regard them as types of Karajarri and use both the general and more specific terms in reference to their language.
McKelson (MS 2688) says that Capell, Worms and Nekes have made studies of Najanaja with reference made to inland Karajarri.
... east of Bidyadanga (McKelson & Dodd 2007:191).
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Speaker numbers were measured differently across the censuses and various other sources listed in AUSTLANG. You are encouraged to refer to the sources.
Speaker numbers for ‘NILS 2004’ and ‘2005 estimate’ come from 'Table F.3: Numbers of speakers of Australian Indigenous languages (various surveys)' in 'Appendix F NILS endangerment and absolute number results' in McConvell, Marmion and McNicol 2005, pages 198-230 (PDF, 2.5MB).