Von Brandenstein (1969 in Thieberger 1993), says Pidungu A40 has at least three dialects. Seen from Peak Hill, they are Kurdun (west), Ngarrka A118 (east) and Yirrakalan A120. There appears to be no language data supplied for these dialects.
Oates and Oates (1970) also make reference to Ngarrga(warngga) A118 as a dialect of Bedengo (A40) (though the other two names are not mentioned) and say that von Brandenstein collected vocabulary. Note that this may be the same identity as Gurduwanga A24, the location of which is very close to that given for Kurdun. Documentation for Birdungu A40 may also be relevant.
... west of Peak Hill (von Brandenstein, in Thieberger 1993).
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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).