Crowley (1976, 1997) treats Yugambal E11, Ngarbal and Marbal E91 as dialects of one language, on the basis of the comment made by MacPherson (1904:683) that speakers of these three languages/dialects understood each other.
Wafer and Lissarrague describe Yugambal E11 and Ngarbal E68 as having a 70% cognate count, and Marbal E91 (about which little is recorded) as closely related (2008: 334).
Not to be confused with Ngarabal E92.
... a group extending from Glencoe to Bolivia (Sharpe 2007 p.c.)
... covering the territory from Stonehenge to Bolivia, including Glen Innes, Wellingrove and Deepwater (Crowley 1976: 21).
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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).