This language was not identified as a distinct variety until recent publications by Nash and Wilkins (2008, based on a 1991 draft by Wilkins) and Wafer and Lissarrague (2008).
On the basis of limited available data (Tuckerman 1887), Wafer and Lissarrague (2008:144) conclude that the Hawkesbury River - Broken Bay language is more likely a dialect of the same language as Darrkinyung S65, which they call the 'Hawkesbury - MacDonald River language', rather than a distinct language.
Note that Tuckerman's data was misidentified as Kameraigal S62 by Oates and Oates (1970:281) and Oates (1975:409).
... extending inland along the northern shore of Broken Bay (Wafer & Lissarrague 2008:165).
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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).