Crowley says (1976:21), there is no linguistic information on this language but he suspects that a word list in Curr (Anonymous 1887) could be of Marbal as it comes from the Marbal territory (1976: 21).
Crowley (1976, 1997) treats Yugambal E11, Ngarbal E68 and Marbal as dialects of one language, on the basis of the remark 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).
Wafer, Jim, and Amanda Lissarrague. 2008. A handbook of Aboriginal languages of New South Wales and the Australian Capital Territory. Nambucca Heads: Muurrbay Aboriginal Language and Culture Co-operative.
About Tenterfield (MacPherson 1904:679).
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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).