Radcliffe-Brown (1929:400) distinguishes Yuungai (E9) from Yegera E10 and writes that the languages were 'similar'.
Tindale (1974) lists Jungai as an alternative name of Jiegera E10; Hoddinott (1978:54) suspects that Yuungay (E9) could be another name for Yaygirr.
Morelli notes that Laves recorded several names of Yungguway (E9) speakers in 1929 (2012:99). Yaygirr is a language name and the name of one of four dialects: Yunggaya, Yaygirr E10, Yirraygirr E99, and Birriin E72. He notes a variant name for Yunggaya: Yuungway or Yuungguway (E9) (2012:1, 99).
Wafer and Lissarrague descibe Yuungay (E9) as a possible dialect of Yaygirr, noting there is no language data in Radcliffe-Brown (1929) or Hoddinott (1978) (2008:358-359).
Birihn E72 is generally considered a dialect of Bundjalung E12 (e.g. Crowley 1978 and Sharpe 2005). Documentation for Yaygirr E10 may be relevant.
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.
Lower Clarence River, NSW (Oates & Oates 1970:158).
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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).